单项选择题

It ______ almost every day so far this month.

A．is raining
B．rained
C．rains
D．has been raining
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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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