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until the lights have turned to green. A.Wait B.To wait C.Waiting D.Having waite

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until the lights have turned to green. A.Wait B.To wait C.Waiting D.Having waite

______ until the lights have turned togreen.

A.Wait

B.To wait

C.Waiting

D.Having waited

 

试题答案

【答案】

A

【解析】略