单项选择题
Gun control is a subject ______ Americans have argued for a long time.
A．of which
B．with which
C．about which
D．into which
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单项选择题
He had lost his temper and his health in the war and never found（）of them again.
A.neither
B.either
C.each
D.all
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单项选择题
It seems water______from this tap for some time. We'll have to take it apart to put it right.
A. had leaked
B. is leaking
C. leaked
D. has been leaking
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