-l have bought an english_chinese dictingary -When and where__you__it B:did buy D:have bought允许写的字太少了,就排除了两个,然后不知道哪一个对,A:do buy C:had bought

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-l have bought an english_chinese dictingary -When and where__you__it B:did buy D:have bought允许写的字太少了,就排除了两个,然后不知道哪一个对,A:do buy C:had bought

-l have bought an english_chinese dictingary -When and where__you__it B:did buy D:have bought允许写的字太少了,就排除了两个,然后不知道哪一个对,A:do buy C:had bought
-l have bought an english_chinese dictingary -When and where__you__it B:did buy D:have bought
允许写的字太少了,就排除了两个,然后不知道哪一个对,A:do buy C:had bought

-l have bought an english_chinese dictingary -When and where__you__it B:did buy D:have bought允许写的字太少了,就排除了两个,然后不知道哪一个对,A:do buy C:had bought
B
一般过去时,你是在什么时候、什么地方买的,用动词过去式
但构成疑问句时,加助动词 did 放在主语前,动词过去式变原型
变成 did you buy,所以B对

B

选 B:did... buy
你什么时候在哪里买的?

B:did buy

B