单项选择题

A．came back
B．came on
C．waved back
D．waved on
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单项选择题
A．thatB．itC．oneD．itself
A．that
B．it
C．one
D．itself
单项选择题
A．pay attention toB．get down toC．be used toD．look forward to
A．pay attention to
B．get down to
C．be used to
D．look forward to
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