《They sang beautifully》PPT课件3 原形 过去式 is/am was 是 are were 是 isnt wasnt不是 arent werent不是 do/does did 助动词 don't/doesn't didn't 没有 Free talk What did you do last Sunday? 你上星期天做了什么? How did you go there?你们怎么去...
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