新东方补充教材的两个题，请大家看一看。

1. [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 the support of
C. Where 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 its supporting of
答案是A。“Where once…”是什么结构？ D有什么不对呢？While的前后对比不挺好吗？

2. The reports from the Department of Commerce indicated that the economy had grown at an annual rate much higher than most economists [U]had predicted may occur.[/U]
A. had predicted may occur.
B. had predicted.

答案是B，LZM说may occur多余，可是没有的话，如何表达经济学家原来的预测情况，是可能发生呢，还是一定会发生？