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()John didn't climbed a mountain yesterday ---- A ------- B

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()John didn't climbed a mountain yesterday ---- A ------- B ---------- C ( )
找出句子中的错误,并改正.(选择在题后括号内,改正在题前括号内)
()John didn't climbed a mountain yesterday ---- A ------- B
John didn't climb a mountain yesterday
再问: 为什么这里climb不用过去式,不加ed?
再答: 因为ed我已经用到前面的did里面了呀,本来前面是do的,转否定句的时候,do 就变成did 了,后面的climbed就变成climb了,明白了吗?