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
When the whole area was ______ by the flood, the government sent food there by helicopter (直升机).
A) cut away
B) cut off
C) cut up
D) cut down
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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