单项选择题

However it is you have heard, you'd better ask him about it in person.()

A. However
B. it is
C. you'd better
D. in

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单项选择题
Your experiment reports must be checked with care before ().

A. handed them in
B. them handing in
C. being handed in
D. handing them in
单项选择题
They () us since five o'clock this morning until now.

A. are helping
B. help
C. have helped
D. have been helping
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