单项选择题

He actually didn't see the man ______ the room, but he heard them ______ in it.

A．to enter, laugh
B．enter, to laugh
C．to enter, laughing
D．enter, laughing
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单项选择题
It is not until recently ______ there are many different kinds of hearing defects.
A．have the scientists discovered
B．the scientists have discovered
C．that the scientists have discovered
D．that will the scientist have discovered
单项选择题
A．mostB．peakC．stageD．state
A．most
B．peak
C．stage
D．state
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