Have you ever visited the Water Cube?Yes.When I served as a volunteerin Beijing,I it twiceA.have visited B.visited C.had visited D.had been visiting为什么不选C

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Have you ever visited the Water Cube?Yes.When I served as a volunteerin Beijing,I it twiceA.have visited B.visited C.had visited D.had been visiting为什么不选C

Have you ever visited the Water Cube?Yes.When I served as a volunteerin Beijing,I it twiceA.have visited B.visited C.had visited D.had been visiting为什么不选C
Have you ever visited the Water Cube?Yes.When I served as a volunteerin Beijing,I it twice
A.have visited
B.visited
C.had visited
D.had been visiting
为什么不选C

Have you ever visited the Water Cube?Yes.When I served as a volunteerin Beijing,I it twiceA.have visited B.visited C.had visited D.had been visiting为什么不选C
选B.一般过去时表示在过去某个时间发生的动作或状态；而过去完成时表示在过去某一时间之前完成的动作.根据句意,我参观水立方两次均发生在我当志愿者期间,而不是之前,故选B.再比如：

Have you had your lunch?
Yes,I had it at 12:00.

  2.I got to the station at 8:00,but the train had left.
  3.I got to the station at 8:00,but the train left at 7:30.
 4.By the end of last year,we had learned 1000 English words.
  5.When I arrived home, my parents had had dinner.
  6.When I arrived home, we had dinner together.

选c的话语境不符。had done是过去完成式，也就是说在这句话中说的情况发生的时候已经做过了，对到这句话来说就是在我去北京做志愿者的时候我已经去了两次了语境不通顺。应该是选b吧，在我去北京做志愿者的时候去过两次。

造句：Have you ever. Have you ever heard Have you ever which 使用 1、 There are not many differences between the Two.I really do not know -------A 、which I should choose B、 What I should choose 2、Is this park-----------you have visited recently?Yes,it is the most beautiful one I have ever visite have you ever与have you ever been的区别 you have ever said before和you have ever said 英语造句have you ever “Have You Ever Seen Me? Have you ever seen snow? have you ever.是什么句型 have you ever fed them? Have you ever had these? Have you ever been employed? Where have you ever been? have you ever [ ] [drink]coke? Have you ever ( ) [study] abroad? have you ever move house have you ever have Italian food?