单项选择题

A．before
B．after
C．while
D．because
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单项选择题
A．impossiblyB．uneasilyC．unluckyD．unfortunately
A．impossibly
B．uneasily
C．unlucky
D．unfortunately
单项选择题
A．differenceB．mistakeC．filmD．difficulty
A．difference
B．mistake
C．film
D．difficulty
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