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
Busy______he is, he can finish the task ahead of schedule.
A．because
B．as
C．no matter how
D．although
单项选择题
He made the suggestion that a deadline______for handing in the plan.
A．be set
B．must be set
C．is set
D．will be set
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