单项选择题

A．whether
B．when
C．where
D．how
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单项选择题
A．disappearedB．reappearedC．flewD．happened
A．disappeared
B．reappeared
C．flew
D．happened
单项选择题
A．muchB．enoughC．timeD．before
A．much
B．enough
C．time
D．before
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