单项选择题

The men will have to wait all day ______ the doctor works faster.

A. if
B. unless
C. whether
D. that
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单项选择题
It was long ______ she returned my book to me.
A. when
B. since
C. that
D. before
单项选择题
— They have done a good job.
A. So they have done
B. So they have
C. So have they

D. So is it
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