When I got to the classroom,I found a boy __________homework in it A.do B.does C.did D.doing

问题描述:

When I got to the classroom,I found a boy __________homework in it A.do B.does C.did D.doing

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。