几道英语选择,关于完成时.

题目

几道英语选择,关于完成时.
By the end of this century,we ____ours into a strong modern country.
A.will build    B.had built     C.have built     D.will have built
2.I ____to help you but couldn't get here in time.
A.want    B.had wanted     C.have wanted    D.was wanting
3.By the time the speaker entered the hall,all the listeners ______.
A.had seated     B.were seated     C.seated      D.were seating


感激不尽.

答案

1 D 见到by the end of就要用完成时.又因为这是表示将来的,所以选D2 B but后面用的是could,是一般过去时态,因为“我想帮助你”发生在“我不能到那儿”之前,即过去的过去,故选过去完成时.3 A 这个题道理和第2题一样,是过去的过去,而且还有by the time 这个词组 要用完成时