---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
D
考查時態(tài)。表示過去某一時刻正在進行的動作用過去進行時態(tài)。句意：湯姆完成他的工作了嗎？我不清楚，他整個上午一直在做。所以選D。
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