单项选择题

A．that
B．which
C．why
D．what
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单项选择题
A． B．butC．soD．when
A．/
B．but
C．so
D．when
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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