______ until the lights have turned to green. A．WaitB．To waitC．WaitingD．Having w_刷题宝

题干

______ until the lights have turned to green.

A．Wait	B．To wait
C．Waiting	D．Having waited

上一题下一题 0.85难度单项选择更新时间:2010-06-20 02:49:29

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