【題目】--I’m exhausted. I ______ on a design day and night.

--You’d better have several days off after finishing it. Otherwise you might break down.

A. work B. worked

C. had worked D. have been working

【答案】D

【解析】

試題分析：考查動詞時態(tài)。句意：--我很累，我整天都在忙著這個計劃。-結(jié)束后你最好休息幾天，否則你會垮掉的。說明做這個項目是從過去到現(xiàn)在說話的時候一直進行的，有可能還要繼續(xù)，用現(xiàn)在完成進行時，A是一般過去式，表示純粹的過去的動作，B是現(xiàn)在完成時，表示過去的動作對現(xiàn)在的影響，C是一般現(xiàn)在時，表示一貫的行為，所以選D。

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