问题描述：
I saw her ______ her homework in the classroom just now.
Where is Maria?
I saw her _______her homework in the classroom just now.
A.do B.did C.to do D.doing
我认为应该是doing,而答案是do.
Where is Maria?
I saw her _______her homework in the classroom just now.
A.do B.did C.to do D.doing
我认为应该是doing,而答案是do.
问题解答：
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