问题 选择题

---Has Tom finished his job yet?

  ---I have no idea of it; he _____ it this morning.

A.has been doing

B.had been doing  

C.did   

D.was doing

答案

答案:D

考查时态。表示过去某一时刻正在进行的动作用过去进行时态。句意:汤姆完成他的工作了吗?我不清楚,他整个上午一直在做。所以选D。

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