By the time we got to the cinema ,the film _______ for half

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By the time we got to the cinema ,the film _______ for half an hour.
A.Has begun
B.Had begun
C.Has been on
D.Had been on
Most environmental problems exist because adequate measure for preventing them taken in the past.
A.Was not
B.Were not
C.Were not being
D.Had not been
第一道,电影开始不是用begin吗?been on还真没遇到过
第二道,环境问题不是在过去之前没有做好,应该选D,过去的过去,为什么错了?
Most environmental problems exist because adequate measure for preventing them ______taken in the past.
第二道的空忘记搞上去了。

第一道题选D项,首先be on 是在这里是“正在进行,正在上演”的意思,根据后面的for 加时间段不难理解的.语法上,前面是过去时,所以电影开始那里应该是过去的过去的,也就是过去完成时.
第二道题的空应该是在taken 前面吧.这个应该选择A项.前面的exist用的是一般现在时,表示这只是一个叙述事实性的句子,并没有过去现在之分,所以was 在这里也只是被动.（有事后碰到这类题不要想太多,综合小分句认真分析就OK了.）

By the time we got to the cinema the film（）for half an hour ,要保证正确率,急,1.By the time we got to the cinema the film（）for by the time we got to the cinema , The film （）（begin）by the time I got to the cinema 动词填空词的适当形式填空 By the time I got to the cinema, the film _________ By the time we got to the cinema,the film_____(begin) by the time we get to the cinema的意思 when they h____ to the cinema,the film had been on for half By the time we got home,my mother _______ (go) out for a wal When we got to the cinema,the film had already started.I ___ when we got to the cinema.The film __________for 20 minutes When I got to the cinema ,the film ( )for five minutes