摘要： -Has Sam finished his homework today? -I have no idea. He it this morning. A. did B. has done C. was doing D. had done [错解] A [纠错心得] 这里的时间状语this moring很容易让考生误选一般过去时.句意为:Sam今天写完作业了吗?我不知道.他今天上午在做着呢.应该使用过去进行时.表示上午当时正做着.但不知是否完成.状语this moming前加上by.则可用过去完成时. [答案] C
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—Has Sam finished his homework today?
—I have no idea. He ________ it this morning.
A. did B. has done C. was doing D. had done
查看习题详情和答案>>— Has Sam finished his homework today ?
— I have no idea. He ______ it this morning.
A. did B. has done C. was doing D. had done
查看习题详情和答案>>― Has Sam finished his homework today?
―I have no idea. He ______ it this morning.
A. did B. has done C. was doing D. had done
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