答案：D
find sb doing sth 表示：发现某人正在做某事.
句意：当我走进教室的时候,我发现一个小男孩在教室里正在做家庭作业.got 是过去式got 是过去式，后面found也是过去式，但是与后面的doing没有关系。find sb doing sth 是固定结构，不管前面found是什么时态，后面都用动词的ing形式。
When I got to the classroom,I found a boy __________homework in it A.do B.does C.did D.doing
When I got to the classroom,I found a boy __________homework in it A.do B.does C.did D.doing
英语人气：164 ℃时间：2019-12-01 13:46:47
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