1.Cars do cause people some health problems,in fact far more serious than those computers do.A.one B.ones C.it D.those
those表那些,computers 是负数.one是单指,用于单数.Ones不能单独用,要配合those 变成those ones.it不能这样用在从句中
2.China __has developed___ at a tremendous rate,an outstanding achievement never seen before,during the past two decades.
A.developed B.has developed C.is developing D.had been developing
因为有during the past two decades 所以是现在完成
3.__To extend___ participation in public decision-making,telephone conference calls are widely used.A.Extend B.Extending C.To extend D.Having extended
这是目的状语从句.to do 表目的
4.37.Tears of joy and happiness came to my eyes ___as__ we won the first prize in the sports meeting
A.while B.as C.unless D.before
as 表原因.因为我们赢得了比赛所以什么什么
while表同时发生.但后面并不是进行时 说明不是在强调同时发生
有什么问题追问我~