题目内容

I don't know ___ they have passed the exam.

A. what
B. if
C. when
D. where

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I hardly understand.___ he has told me.

A. that
B. what
C. which
D. who

She didn't know___ back soon.

A. whether he would be
B. if would he be
C. he will be
D. he would be

I don't know _____ he still lives here after so many years.

A. whether
B. where
C. what
D. when

Do you know _____ they listened to yesterday evening?

A. what
B. when
C. why
D. how