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

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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

单项选择题

This year we will produce ______ they did last year.

A．as twice many cars as
B．twice as many than cars
C．twice as many cars as
D．cars twice many that

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