—Has Billy finished his homework today?
—I have no idea.He        it this morning.
A．would doB．was doingC．has doneD．had done
B
依據(jù)答語中的時間狀語可推知，比利作業(yè)未完成。他今天上午一直在做。過去進行
時除表示某段時間內(nèi)一直在進行的動作外，還可表示某時刻正在進行的動作。如：
I was reading a book when he came in.
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