单项选择题

So far there is no proof()people from other planets do exist.

A．which
B．that
C．what
D．how

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单项选择题

Tom didn't tell his wife that he had been fired, but he().

A．would do
B．had to
C．should have
D．might have to

单项选择题

() we have finished the course, we shall take a new one.

A．Since now
B．Since that
C．Now that
D．By now

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