单选题
—Has Torn finished his homework?
—I have no idea; he______it this morning.
A、
was doing
B、
had been doing
C、
had done
D、
did
【正确答案】
A
【答案解析】
该题测试动词时态的用法。题干中的时间状语this morning是解题的关键。使用过去进行时不表示动作的完成，故选用选项A与其前的I have no idea配合。
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