Question

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

---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

Answer 1

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。