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— Has Sam finished his homework today?  
— I have no idea. He ________ it this morning.  
A.didB.was doingC.has doneD.had done
B
考查动词的时态。根据this morning可知句子要用一般过去时态的某种形式,且表明今天早晨我看见他时他正在做作业,所以选B。
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