题目内容

- Has your friend completed his design?   - Not yet. He ________ on it last night.
A．workedB．has worked C．is workingD．was working
D

试题分析：句意：—你的朋友完成了他的设计了吗？—还没有。昨晚他一直在做。A. worked一般过去时，说明过去的情况，与现在无关；B. has worked现在完成时，说明现在已经完成；C. is working现在进行时，表示现在正在做的事；D. was working过去进行时，表示过去某个时间或时间段内正在做的事。分析句意可知用过去进行时。故选D。
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