单项选择题

I wonder ______ this kind of metal can be used in the construction industry.

A. how
B. what
C. about
D. which
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单项选择题
The reason ______ he didn't come was ______ he was ill.
A. why; that
B. that; why
C. for that; that
D. for which; what
单项选择题
She is willing to help you, ______ busy she is.
A. what
B. how
C. however
D. whatever
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