__________for the bus, I heard a noise,A．While waitingB．While I waitingC．I was w_刷题宝

题干

__________for the bus, I heard a noise,

A．While waiting

B．While I waiting

C．I was waiting

D．Waited

上一题下一题 0.85难度单项选择更新时间:2010-11-30 11:27:58

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