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    精英家教网 > 高中英语 > 题目详情
    Mountain climbing ________ be very tiring, and many people feel sick ________ the atmosphere gets thinner.
    A．may; whileB．can; asC．must; thoughD．should; for
    B

    试题分析：考查情态动词和连词，第一空填could，表示客观可能，第二空填as，引导时间状语从句，表示当…时候，随着，句意：爬山可能让人疲劳，随着空气变得稀薄很多人会感到不适。选B。
    点评：could可以表示“有能力”或者是“有客观的可能”，还有同样是当…时候，while表示“一段时间”，as表示“随着”。
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