Why ( ) the teacher let him ( ) the classroom yeserday afternoon A did.to clean B does.clean还有两个

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Why ( ) the teacher let him ( ) the classroom yeserday afternoon A did.to clean B does.clean还有两个
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Why ( ) the teacher let him ( ) the classroom yeserday afternoon A did.to clean B does.clean还有两个
Why ( ) the teacher let him ( ) the classroom yeserday afternoon A did.to clean B does.clean还有两个

Why ( ) the teacher let him ( ) the classroom yeserday afternoon A did.to clean B does.clean还有两个
填 did clean
因为有yesterday,是过去时,助动词用did
let sb do .后面动词用原形

B
let sb. do sth. 让某人做某事,所以答案: B
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应该是 did clean
后面有 yesterday 所以用过去式 。let sb do 不用 不定式
所以 两空分别是 did 和 clean
望采纳