题是：-who is the woman over there?-Diana Spencer,or Princess Di（A)she became well-known.选项：A as ；B for；C before ;D since 为什么要选A?

题是：-who is the woman over there?-Diana Spencer,or Princess Di（A)she became well-known.选项：A as ；B for；C before ;D since 为什么要选A?
题是：-who is the woman over there?-Diana Spencer,or Princess Di（A)she became well-known.选项：A as ；B for；C before ;D since 为什么要选A?

题是：-who is the woman over there?-Diana Spencer,or Princess Di（A)she became well-known.选项：A as ；B for；C before ;D since 为什么要选A?
as在这里是引导从句的,但是在这里其实并不是主要指原因,而是强调“随着”的意思,也就是随着“she became well-known”（她越来越有名）,人们不会再称呼她的本名戴安娜了,而是取而代之一个称号princess（王妃）.
如果是要带原因从句的话,其实B和D都可以
as这个词,建议你再查查字典,意思很多

A貌似是因为的意思
原因状语从句
一 because, since,as和for引导的原因状语从句
1 because(因为）：表示直接的原因或理由，着重点在从句，用于回答why，语气最强。
He didn't go to school because he was ill.
Why didn't he go to school? Because h...

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A貌似是因为的意思
原因状语从句
一 because, since,as和for引导的原因状语从句
1 because(因为）：表示直接的原因或理由，着重点在从句，用于回答why，语气最强。
He didn't go to school because he was ill.
Why didn't he go to school? Because he was ill.
2 since(既然）：一般表示对方已知的，无须加以说明的即成事实的理由，全句中心在主句，语气比
because弱。
Since you are ill, I'll go alone.
3 as(由于）：表示十分明显的原因，一般说明因果关系，着重点在主句，语气较弱。
As it is snowing, we shall not go to the park.
4 for(因为，其理由是）：是个并列连词，只能放在另一个并列句后面，表示推理或解释，或用作附加说明，表示新的情况，而不是指理由或原因，语气最弱，一般不放在句首。
The day breaks, for the birds are singing.
* for表示因果关系时，可以同because交替使用，但for前须用逗号，而because则不必。
You couldn't have seen him because he wasn't there.
= You couldn't have seen him, for he wasn't there.
*当原因是显而易见的或已为人们所知，就用as或since，且多放在句首。
Since/ As the weather is so bad, we have to delay our journey.
二 now (that) (既然，现已...所以，当...才）；
Now (that) you've grown up, you should not behave like a child.
Now (that) I am older I see things differently.
Now (that) I have heard the music I understand why you like it.
这两个题我也不会,高考这种题考的不多吧,我们上高三的时候,很少考for的这种用法.如果不明白的话,就把它记住吧.
参考资料：http://i.cn.yahoo.com/04400017582/blog/p_9/

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