单项选择题

You are supposed to （） in your composition yesterday.

A. hand
B. be handing
C. have handed
D. handing

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A new technique （） worked out, we set about our project.

A. being
B. to be
C. having
D. having been
单项选择题
He was attending a meeting, （） come to your birthday party then.

A. unless he would have
B. or he would
C. but he did not
D. or he would have
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