单项选择题

This is the second time that John __________ in his final exam.

A. has failed
B. fails
C. failed
D. failing
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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
There are still several unanswered questions ______ with the accident.
A. connect
B. to connect
C. connected
D. connecting
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