---Has Tom finished his job yet?　 ---I have no idea of it; he it this morning.A. has been

问题补充：

---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：

A. has been doing

B. had been doing

C. did

(答案→)D. was doing

解析：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。