单项选择题

A．race
B．pace
C．speed
D．step
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单项选择题
A．BecauseB．WhileC．SinceD．When
A．Because
B．While
C．Since
D．When
单项选择题
A．to buyB．buyingC．having boughtD．from buying
A．to buy
B．buying
C．having bought
D．from buying
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