单项选择题

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

A. being
B. to be
C. having
D. having been

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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
单项选择题
It was （） that he heard of the victory of the Chinese revolution.

A. Stephen
B. with Stephen
C. by Stephen
D. from Stephen
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