因为主语就是who所以不需要助动词,所以就是不用动词原形啦
如果：When did you buy a new bike 这里主语不是疑问词,所以需要助动词,所以就是动词原形了
who bought a new bike yesterday?疑问句中动词不是用原型嘛?为什么这里用bought而不是
4个回答
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I have just bought a new bike 这里为什么用bought
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A new bike was bought for him 还是 has been bought for him aft
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i bought a new bike just now用just改写 i（ ）just