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    精英家教网 > 初中英语 > 题目详情

    【题目】Scientists say we will have no water to drink _________ we protect water resources.

    A. ifB. whenC. beforeD. unless

    【答案】D

    【解析】

    句意：科学家们说除非我们保护水资源，否则我们将没有水喝了。if如果；when当…时候；before在…之前；unless除非，如果不。根据句意可知，这里表示“如果我们不保护水资源，我们就将没有水喝”，故应选D。

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