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
Jane always enjoys（）to popular music at home on Friday evenings.

A．listening
B．to be listening
C．being listening
D．to listen
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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