We________on this project for four hours.Let's have a rest.
A．a(chǎn)re workingB．have been working
C．workedD．had worked
B
　B　[考查時態(tài)。從for four hours以及下文的Let's have a rest.可以看出是謂語動詞表示的動作到目前為止已經(jīng)持續(xù)了一段時間并有可能繼續(xù)下去，所以用現(xiàn)在完成進行時。]
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