单项选择题

There has been a ______ increase of complaint about the matter because of misunderstanding.

A．regretting
B．regretted
C．regretful
D．regrettable

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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

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

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