— Has Sam finished his homework today?　　
— I have no idea. He ________ it this morning.　　
A．didB．was doingC．has doneD．had done
B
考查動(dòng)詞的時(shí)態(tài)。根據(jù)this morning可知句子要用一般過去時(shí)態(tài)的某種形式，且表明今天早晨我看見他時(shí)他正在做作業(yè)，所以選B。
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