单项选择题

I'm very busy () for the exam now. Will you come again at some other time.

A.to prepare
C.prepared
B.to be preparing
D.preparing

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单项选择题
Not until I arrived at the gate of school () back.

A. he had turned
B. he didn't turn
C. that he turned
D. did he turn
单项选择题
You'd better () that next time.

A.not to say
C.not said
B.not saying
D.not say
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