单项选择题

He must have come here yesterday evening, ______ he

A. did
B. has
C. haven't
D. didn't
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单项选择题
Her husband ______ on in the hospital this time yesterday.
A. being operated
B. was being operated
C. was operating
D. operated
单项选择题
The next board meeting will focus______the benefits for the employees．
A．by
B．for
C．with
D．on
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