单项选择题

He is ill in bed, ______ we should take care of him.

A. so
B. but
C. either
D. nor
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I wish I ______ some use.
A. could be of
B. could be
C. will be of
D. will be
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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