单项选择题

My room is a mess. It needs ______.

A．to be tidying up
B．tidying up
C．to tidy up
D．tidied up
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单项选择题
We were not surprised at ______, for he had worked so hard.
A．what has he achieved
B．that what he had achieved
C．what he had achieved
D．that he had achieved
单项选择题
Young ______he is, he knows what is the right thing to do.
A．that
B．as
C．although
D．however
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