仅仅一道题选择.Before ______ any buses ,they will have to take a special test .A to drive B driving they will drive.B A B C.

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仅仅一道题选择.Before ______ any buses ,they will have to take a special test .A to drive B driving they will drive.B A B C.

仅仅一道题选择.Before ______ any buses ,they will have to take a special test .A to drive B driving they will drive.B A B C.
仅仅一道题选择.
Before ______ any buses ,they will have to take a special test .
A to drive B driving they will drive.
B A B C.

仅仅一道题选择.Before ______ any buses ,they will have to take a special test .A to drive B driving they will drive.B A B C.
这道题考查的是非谓语动词,
主语不能连接两个句子,所以不能选C,
这道题主语是they,他们与谓语开汽车是主动的关系,所以用ING 形式
TO DO 表目的,无法解释的通,不合题意

before是介词,后面接名词

Before 是介词,其后面要跟动名词

个人认为三楼才是对的