i'm not sure ______ he is speaking at the meetingA that B who Cwhether Dwhat

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i'm not sure ______ he is speaking at the meetingA that B who Cwhether Dwhat
i'm not sure ______ he is speaking at the meeting
A that B who Cwhether Dwhat

i'm not sure ______ he is speaking at the meetingA that B who Cwhether Dwhat
其实都可以耶
I'm not sure that he is speaking at the meeting.和I'm not sure whether he is.不知道他要不要讲
I'm not sure who he is speaking at the meeting.不知道他讲的是关于谁
I'm not sure what he is speaking at the meeting.不知道他在讲什么

C whether

C.whether

选C没问题的。我不能肯定他是否要在会议上讲话。“is speaking"是现在进行时表将来，表示计划、安排等；be加表语形容词加从句这种结构，中学阶段讲的是宾语从句，这样的例子很多，比如i'm afraid that...,i'm sorry that.... 所以宾语从句可以是在动词后，也可在介词后，还可在形容词后。...

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