求助大全 补充250 138, 快考试了急！

Where once the union had acquiesced to the prejudices of its English-Speaking members by supporting the imposition of an alien tax on immigrant workers, after 1897 the United Mine Workers made a determined effort to enlist Italians and Slaves in its ranks.

(A) Where once the union had acquiesced to the prejudices of its English-Speaking members by supporting
(C) While once the union had acquiesced to the prejudices of its English-Speaking members in support of

答案是A，但我还是觉得C比较好。

以前做错过，现在再看一遍觉得还是不理解，where能表示转折或对比？

C的主要问题应该是in support of 是目的不是A中by supporting表示的手段。如果C将in support of 改为by supporting，就是正确选项。

A中where确实也有类似while的转折的作用（个人认为，对比的程度不及while）。举例如下：where

used to say that one person, thing, opinion etc is different from another

for example

Where others might have been satisfied, Dawson had higher ambitions.

厉害！一语道破玄机！佩服佩服！