因为你用了两个动词,一个谓语动词were,一个动作动词bought,英语一个句子是不能有两个动词的,除非被动态或者进行时（+ing）.
所以,这句话的提问,要用助动词did,带出buy.
所以正确答案：what did you buy yesterday?
What were you bought yesterday.
What were you bought yesterday.
答案是what did you buy yesterday
我是想知道为什么
答案是what did you buy yesterday
我是想知道为什么
其他人气：238 ℃时间：2019-09-17 18:10:44
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