单项选择题


A．are
B．would be
C．was
D．were
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单项选择题
A．whenB．whereC．howD．what
A．when
B．where
C．how
D．what
单项选择题
A．on whichB．in whichC．whichD．under which
A．on which
B．in which
C．which
D．under which
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