— I have bought an English-Chinese dictionary .— When and where _______ you _______ it ? A. do ; buy B. did ; buy C. have ; bought D. will ; buy B和C是不是都可以?

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—IhaveboughtanEnglish-Chinesedictionary.—Whenandwhere_______you_______it?A.do;buyB.did;buyC.have;bou

— I have bought an English-Chinese dictionary .— When and where _______ you _______ it ? A. do ; buy B. did ; buy C. have ; bought D. will ; buy B和C是不是都可以?
— I have bought an English-Chinese dictionary .
— When and where _______ you _______ it ?
A. do ; buy B. did ; buy C. have ; bought D. will ; buy

B和C是不是都可以?

— I have bought an English-Chinese dictionary .— When and where _______ you _______ it ? A. do ; buy B. did ; buy C. have ; bought D. will ; buy B和C是不是都可以?
选B,第一句是过去完成时,所以第二句应该用过去时态.bought是buy的过去时态,did是do的过去式,后面用动词原形.所以用did,buy.