问题
选择题
— Has Sam finished his homework today?
— I have no idea. He ________ it this morning.
A．did
B．was doing
C．has done
D．had done
答案
答案：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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