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A
though
B
unless
C
lest
D
provided
正确答案 :B
解析
【金标尺答案】B 【金标尺解析】本题考查英语句法——状语从句。 句意:我们根本无法与其他公司竞争,除非我们改善我们的发动机设计,降低生产成本。 根据句意,只有 B 项“除非”符合句意,故 B 项符合题意。 A 项:“尽管”,不符合题意,故排除; C 项:“以防、以免”,不符合题意,故排除; D 项:“如果”,不符合题意,故排除; 故本题答案为 B。
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