高一英语时态填空（2）thecountrylifehewasusedto(change)greatlysince1992.uptonow,theprogram(save)thousandsofchildrenwhowouldotherwisehavedied.eachofthestudentsworkinghardattheirlessions

Question

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

Answer 1

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.