单项选择题

I regret ______ you the news that he is going to leave us for good.

A．to tell
B．telling
C．having told
D．to have told
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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
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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