单项选择题

Our department has a large collection of books()are in English.

A．many of which
B．many of them
C．many ones
D．their many

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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
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
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