单项选择题

Although ______ happened in that developed country sounds like science fiction, it could occur elsewhere in the world.

A．which
B．what
C．how
D．it
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单项选择题
There are four departments at this college, ______ more than five hundred students.
A．with each have
B．each having
C．each of them have
D．with each is having
单项选择题
Where did you get your watch______
A．repair
B．to repair
C．repaired
D．repairing
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