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

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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

Nobody but Sam and Tom ______ in the lab.

A) are
B) have been
C) were
D) is

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