---- Has Sam finished his homework today?
---- I have no idea. He ________ it this morning.
A．didB．has doneC．was doingD．had done
C
考查時態(tài)。句意：今天Sam完成作業(yè)了嗎？我不知道，他今天上午在做。表示過去某一時刻進(jìn)行的動作用過去進(jìn)行時態(tài)。根據(jù)題意上午那個時刻他在做作業(yè)，故選C。
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