几道英语虚拟语气的题2.Some scientists say it is important that the amo

几道英语虚拟语气的题
2.Some scientists say it is important that the amount of air pollution in big cities ______.A.reduce B.be reduced C.reduced D.will be reduced这是宾语从句里套了个表语从句吧 但为什么选b
11.---I haven't seen Diana at the party.
---If it were not for the fact that she _____ too busy with her work,I _____ her.A.was; will invite B.should be; would invite C.is; would invite D.had been:will invite这道为什么选c
31.The patient insisted that he _______ ill and _______ to the hospital.A.wasn’t,wasn’t sent B.wasn’t,shouldn’t be sent C.shouldn’t be,wasn’t sent D.shouldn’t be,shouldn’t be sent为什么选b 不是insist的宾语从句后加should do吗
34.Without the air to hold some of the sun’s heat,the earth at night ____ for us to live.A.would be freezing cold B.will be freezing coldly C.would be frozen cold D.can freeze coldly为什么 选a 不应该是be frozen coldly被冻得很冷吗
45.This printer is of good quality.If it __________ break down within the first year,we would repair it at our expense.
A.would B.should C.could D.might问什么选b?
47.He did not regret saying what he did but felt that he _________ it differently.(2009年高考江苏卷)
A.could express B.would express
C.could have expressed D.must have expressed为什么选b could express不行吗 他不后悔说了他做的但是感觉他能用不同的方式表达

2.选b是因为从句里用should+动词原形表示虚拟语气,表示本该被减少的空气污染,而实际没有减少
11she is too busy,是现在的情况,是实际情况,所以用is.第二空用would也是虚拟语气标志,前面的if从句的be动词用were,主句用would be,表示对将来的虚拟.
31.第一空填wasn't 是过去的实际情况,不是虚拟情况,所以不用should do
34.是freeze的用法问题,可以查查字典