单项选择题


A．to buy
B．buying
C．having bought
D．from buying
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单项选择题
A．forB．toC．ofD．if
A．for
B．to
C．of
D．if
单项选择题
A．live up toB．catch up onC．put up withD．keep up with
A．live up to
B．catch up on
C．put up with
D．keep up with
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