HIs lecture was difficult and I didn't know -------he said meant in his lecture.A.that B.what C.tHIs lecture was difficult and I didn't know -------he said meant in his lecture.A.that B.what C.that that D.what waht 请问为什么选D

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HIs lecture was difficult and I didn't know -------he said meant in his lecture.A.that B.what C.tHIs lecture was difficult and I didn't know -------he said meant in his lecture.A.that B.what C.that that D.what waht 请问为什么选D
HIs lecture was difficult and I didn't know -------he said meant in his lecture.A.that B.what C.t
HIs lecture was difficult and I didn't know -------he said meant in his lecture.
A.that B.what C.that that D.what waht
请问为什么选D

HIs lecture was difficult and I didn't know -------he said meant in his lecture.A.that B.what C.tHIs lecture was difficult and I didn't know -------he said meant in his lecture.A.that B.what C.that that D.what waht 请问为什么选D
的确选D,先看看后面那个what--what he said,这的what指代的是said后面的内容,翻译出即使“他所说的”
前面那个what--what （what he said做这从句中的主语）meant in his lecture,这个what指代的是meant后面的内容,翻译出来是“（他所说的）在他的演讲中意味这的什么”
这个句子的意思是：他的演讲很难,我不知道他所说的在他的演讲中意味的什么.（即指我完全不懂他在说什么）

应该是填that what

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选C
首先你可以理解第一个that是从句的连接词。
第二个that，判断有点麻烦。先把后半句的语序颠倒回正常语序为：___he said in his lecture meant.然后that 作为代词出现代表他说的东西，再接上一个定语从句。所以整个句子应该是以下：
His lecture was diificult and I didn't know(主句) that(从句连词) that（代词做从句的主语（that / which）（定语从句连词，因为不做成分所以被省略）he said(定语从句主干)meant(从句谓语动词) in his lecture（定语从句中被后置的状语）
我个人是这么理解的，如果觉得有道理，望采纳~~~~~~

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He was absent from the lecture again,and that is ____ his profressor got angry. HIs lecture was difficult and I didn't know -------he said meant in his lecture.A.that B.what C.tHIs lecture was difficult and I didn't know -------he said meant in his lecture.A.that B.what C.that that D.what waht 请问为什么选D HIs lecture was difficult and I didn't know -------he said meant in his lecture.A.that B.what C.tHIs lecture was difficult and I didn't know -------he said meant in his lecture.A.that B.what C.that that D.what waht professor wang _____for his informative lecture,was warmly received by his studentsa knowing b known c to be known d having known考察什么语法选什么为什么 the professor was quite used to students’ being late for his lecture.the professor 是主语was是谓语动词后面是什么成分? lecture lecture Although punctual himself,the professor was quite used（）late for his lecture.A.to have studentsB.for students' beingC.for students to beD.to students' being 用括号连词改写以下句子.James will give a lecture at the local library next week.His book on the Antarctic was published recently.(whose) 为什么下面后半句独立主格要用过去分词,即attention要用被动吗?Jim was listening attentively to the lecture,all his attention fixed upon it . such an informative lecture was it 还是such an informative lecture it was Once Einstein gave a lecture in many places in America． His driver always listened to him and knew the lecture so well that he was sure be could give it himself． So Einstein agreed that the driver gave the lecture him．As nobody knew Einstein th 很着急!谢谢Once Einstein gave a lecture in many placesOnce Einstein gave a lecture in many places in America.His driver always listened to him and knew the lecture so well that he was sure that he could give it himself.So Einstein agreed that th 反义疑问句No one was interested in his lecture,_____?答案是were they为什么用这个?帮忙找一点依据或者一些特殊的反义疑问句的用法能不能用 was he?或者 was it it was boring,a lecture for me.a lecture for me是句子的什么成分 The lecture,which was so boring,seemed e____ No lecture was attended by every student.和 No lecture was attended by any student.的区别 The rude boy______ have rushed out of the classroom when Ms Green was giving a lecture,which finally led to his being published by the head teacher.A could B must C dare Dshould为什么不选A