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bigmouse

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

(A) Where once the union had acquiesced to the prejudices of its English-speaking members by supporting

(B)Where once the union acquiesced to its English-speaking members' prejudice for support of

(C) While once the union had acquiesced to the prejudices of its English-speaking members in support of

(D)) While once the union acquiesced to its English-speaking members'prejudice in supporting

(E) While once the union had acquiesced to the prejudices of its English-speaking members in supporting of

Answer:A . why?

tongxun

1、Where once 好象是个固定用法。
2、后面是过去式，前面的动作先发生，所以用过去完成式
3、通过什么方式，用by supporting 比in support of 等好。