单项选择题

You()yesterday if you were really serious about your work.

A. ought to have come
B. ought have come
C. would come
D. ought to be coming

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单项选择题
I would have come sooner but I () that you were waiting.

A. wouldn' t know
B. didn' t know
C. haven' t known
D. don' t know
单项选择题
The children won't go there to watch the iron tower ().

A. to erect
B. to be erected
C. erecting
D. being erected
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