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
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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
单项选择题
This is one of the best books ______ on the subject.
A．that have ever been written
B．which have ever been written
C．that has ever been written
D．whatever have been written
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