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 ____
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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 ____
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
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 ____
has changed. 因为since 1992 是现在完成时时间状语
has saved. up to now是现在完成时的时间状语
has read. 这是强调影响和结果,所以用现在完成时.（现在完成时的定义）
have dreamed. 现在完成时的时间状语for+一段时间.
这些题都是考察现在完成时的用法.