单项选择题

I was really worried about you. You ______ home without a word.

A. mustn't leave
B. shouldn't have left
C. couldn't have left
D. needn't leave
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单项选择题
We consider () the instrument be adjusted each time it is used.

A. that it necessary
B. it necessary that
C. necessary that
D. necessary of it that
单项选择题
Hardly () the TV () the electricity was cut off.

A. had I turned on…when
B. did I turn on…than
C. have I turned on…before
D. does I turn on…after
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