—Has Sam finished his homework today?
—I have no idea. He ________ it this morning.
A．didB．has doneC．was doingD．had done
C
 根據(jù)句意“我不知道Sam現(xiàn)在是否已經(jīng)做完了作業(yè)，(但是我知道)他今天早上一直在做作業(yè)”，可知要用過(guò)去進(jìn)行時(shí)。
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