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when I was one year old,i could ______, I couldn't _________

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when I was one year old,i could ______, I couldn't __________要怎么写啊
A. laugh,run B. laughing,running
这什么意思额……
when I was one year old,i could ______, I couldn't _________
选A could是can的过去式 后面加动词原形 这句话意思是:当我一岁时,我会笑了,但我不会跑.
再问: 第二个空格呢?
再答: 选A啊 第一个空格:laugh 第二个空格:run