单项选择题

--Charles says you should have reported the accident to the police.
--I don't know ______ good they could have done.

A．how
B．that
C．what
D．which
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单项选择题
His sister was left alone, with ______ to look after her.
A．someone
B．anyone
C．everyone
D．no one
单项选择题
______ student ______ work out the maths problem.
A．Any, can’t
B．No, can
C．Not, can
D．All, can’t
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