We________on this project for four hours.Let's have a rest.

A.a(chǎn)re working B.have been working

C.worked D.had worked

 

B

【解析】 B [考查時(shí)態(tài)。從for four hours以及下文的Let's have a rest.可以看出是謂語動(dòng)詞表示的動(dòng)作到目前為止已經(jīng)持續(xù)了一段時(shí)間并有可能繼續(xù)下去,所以用現(xiàn)在完成進(jìn)行時(shí)。]

 

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