单项选择题

What can we do for them () all the help they have given us

A. in regard to
B. in return for
C. in honour of
D. in reply to

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单项选择题
() what to do, he went to the old man for help.

A. Not knowing
B. Not know
C. Not to know
D. Not known
单项选择题
In their letter to the students' representative assembly, the freshmen insisted on()in the Student Union.

A. represented
B. being represented
C. having represented
D. have been represented
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