单项选择题


A．/
B．but
C．so
D．when
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单项选择题
A．whichB．whatC．thatD．where
A．which
B．what
C．that
D．where
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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