高一英语 时态填空（2）

题目

高一英语 时态填空（2）

the country life he was used to ________(change) greatly since 1992. 

up to now ,the program ____________(save)thousands of children who would otherwise have died.

each of the students working hard at their lessions ________________(read)the books.

for many years,people ________(dream)of electric cars.

最好有解释   谢谢

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