关于英语时态的一个问题Theyoungteacherhadscompetent.AbeenprovedtobeBprovedtobeCbeenprovedDhasbeenMostenvironmentproblemsexsitbecauseadequatemeasuresforpreventingthemtakeninthepast.AwasnotBwerenotCweren

Question

关于英语时态的一个问题
The young teacher hads____competent.
A been proved to be
B proved to be
C been proved
D has been
Most environment problems exsit because adequate measures for preventing them___taken in the past.
A was not
B were not
C were not being
D had not been
这2个题目为什么会选B,能不能帮我每个答案分析一下.

Answer 1

第一题：PROVE不用被动形式,你不能因为中文说被证明而选A或是C,D是因为hads后要用原形,因此选C;第2题也是这个问题,中文中有被动的意思,英文不是这样的,前面MEASURES所以用复数,A去掉,WERE TAKEN已经表达被动含义了,不需要再加BEEN.建议你把语法好好看一看,很基础,不难.希望能帮助你,呵呵