一个英语对话填空--who cleaned yhe classroom?--Tom_____.为什么只能填did而不是cleaned?

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一个英语对话填空--whocleanedyheclassroom?--Tom_____.为什么只能填did而不是cleaned?一个英语对话填空--whocleanedyheclassroom?--T

一个英语对话填空--who cleaned yhe classroom?--Tom_____.为什么只能填did而不是cleaned?
一个英语对话填空
--who cleaned yhe classroom?
--Tom_____.
为什么只能填did而不是cleaned?

一个英语对话填空--who cleaned yhe classroom?--Tom_____.为什么只能填did而不是cleaned?
did代替cleaned the classroom,不能单用一个cleaned

did
用cleaned后面必须加宾语
Tom cleaned the classroom
did后面可以省略..- - |

--who cleaned yhe classroom?
--Tom_did____.
为什么只能填did而不是cleaned?
如果填了cleaned 那么后面就要跟宾语
否则就断句了