---Who cleaned the classroom yesterday?---John ().A.cleaned B.does C.did D.is
题目
---Who cleaned the classroom yesterday?---John ().A.cleaned B.does C.did D.is
答案
Who cleaned the classroom yesterday?
John (did).
昨天是谁打扫的教室?
约翰打扫的.
did 用来替代前面出现过的cleaned.
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