when did you buy the camera?I have had it for two days.A：have bought B:have had C:bought.为什么选B答案,而不选A

when did your father buy you the mobile phone 换为被动语态 when（ ）the mobile phone when（ ）you?when （ ）you 是隔开的,要两句 24.Jack,could you tall me__?Sure.In the post office on Green Road.A.where you bought the stamps B.where did you buy the stamps C.when you bought the stamps D.when did you buy the stamps When did you buy your mobile phone改为被动语态 为什么是“Can you tell me when he bought the car而不是Can you tell me when did he buy the car --When __ you __ the bike.--Last month.填did;buy,为何have ;bought不行,句中有说到时态吗? what did you buy 19.What a new computer!Can you tell me__?Just the day before yesterday.A.how much you paid for it B.how much did you pay for it C.when you bought it D.when did you buy it When did he buy the house?He____[buy] it last year.谁能帮我做上面这道题啊? when did you take the medicine last when did you arrive.the museum? 连成句 英语1:you did back come when 2:buy ice creams some let's .3:in city live do this you 4:buy at all didn't anything I .5:Lingling yesterday go park to the did when did he buy the car 和when he bought the car 怎么区别在哪 —When ___ you ___ the e-dictionary?—Last month.A.have,bought B.had,bought C.do,buy D.did,buy—When ___ you ___ the e-dictionary?—Last month.A.have,bought B.had,bought C.do,buy D.did,buy答案给的是D,但我想知道为什么B不行. 翻译 How much did you buy the new computer for? who did you buy the present for for___(l) Did you buy anything for y______ at the store? What did you buy the watch for同义句 you can buy some fruits when you (_____) the shop