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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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 imperative that the students ______ to hand in their papers on time.
A．told
B．be told
C．are told
D．have been told
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