Read the passage carefully Bselect a right title for

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Read the passage carefully ____B____select a right title for it.
A.or B.and C.until D before
为什么要选B不选D?
______B____the problem for many years,the scientist announced that we are now facing the biggest environment problem of our time
A.observing B.Having observed C.To have observed D.observed
为什么选B不选D
I won'ttake further action before the news___D__
A.will confirm B.will be confirmed
C.confirms D.is confirmed
为什么选D?

第一题如果选before 的话,这个地方before是介词,后面应该接名词、动名词或者是句子.选and的话,and 是连词,就可以接动词原形了.
第二题Having observed the problem for many years整个短语作 the scientist 的定语,所以用动名词.
第三题,我按自己的理解解释一遍吧.这个句子翻译成中文就是“在这个新闻被证实之前我是不会有进一步的行动的.”它的意思与逻辑顺序和‘I will take further action if the news is confirmed.’是一样的.我们用“主将从现”来解释这里从句要用现在时.我觉得这不仅是一个无法找出理由的语法现象.在这里“新闻会被证实”被当做了前提,我们假设“新闻会被证实”是一个事实,将自己放在那样一个情境中去考虑问题,所以用一般现在时.而主句是表示现在对将来的计划,所以用将来时.那么在这个句子中也是同样的情况.我想是因为这样所以才有pamping的说法吧.

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