单项选择题


A．which
B．what
C．that
D．where
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单项选择题
A．whenB．whileC．timeD．hour
A．when
B．while
C．time
D．hour
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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