单项选择题

I don't remember ______ to Professor Brown during my last visit to Harvard.

A. having introduced
B. having been introduced
C. to have introduced
D. to have been introduced
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单项选择题
It's necessary that the problem______in some way or other．
A．is settled
B．was settled
C．be settled
D．has been settled
单项选择题
Andrew has a good ______ of French.
A. study
B. learning
C. command
D. possession
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