补充250-138题 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 Slavs in its ranks. (A) Where once the union had acquiesced to the prejudices of its English-speaking members by supporting (E) While once the union had acquiesced to the prejudices of its English-speaking members in its supporting of
答案A, 查过以前的解释,但无人解释Where Once 在这里是什麽意思呀?实在不明白,整个句子是否有转折的意思呢?
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