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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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
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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