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英语
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He telephoned agin.but i didn't answer the phone!
为什么在前半句的动词加了ed 而后半句为什么answer不加ed呢?
人气:418 ℃ 时间:2020-01-31 13:00:01
解答
did就是do的过去式,表示强调answer这个动作,而且did后面用原型
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