单项选择题
It is not the tools a scientist uses but how he uses them that( )him a scientist.
A.make
B.makes
C.made
D.will make
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单项选择题
Every field of chemistry( )different chemical reactions.
A.holds
B.consists
C.composes
D.involves
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单项选择题
When Bob and his friends came, we( )our supper then.
A.had
B.were having
C.have
D.are having
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