When did you first visit China?I think it _____in 1996,when my parents were teaching in YunnanUniversity.A.must be B.should have been C.may be D.must have been其余选项为什么不对,尤其是A?

when did you first play piano? when did you first piay a computer game?怎么回答? when did you first read an english book 怎么回答 did,an English book,when ,first,you,read when did you first play a computer game when did you first play a computer game（回答） when did you first go to the cinema?(回答) when did you first go to the cinema? When did you leave? When did you coneback? when was the last time you did something for the first time中文翻译 英语翻译when was the last time?you did something for the first time? When did you first go to the cinema?意思!并且应该怎么回答? When did you first go to the cinema?回答这个问题要求使用ago. When did you have your first online chat?怎么回答求答案! I'new here.Could you tell me __,please?A.when does the first bus arrive B.when the first bus arrivesC.when did the first bus arrive D.when will the first bus arrive 为什么选B呢? I'm new here.Could you tell me____,please?a.when dose the first bus arrive b.when the first bus arrivesc.when did the first bus arrive d.when will the first bus arrive __that dress when I first saw you at the airport A.Were you wearing B.Did you wear