题目内容
10.We will have no water to drink __________we don't protect the earth.( )| A. | until | B. | before | C. | though | D. | if |
分析 如果我们不保护地球,我们将没有水喝.
解答 答案D until意为"直到…时候才"引导时间状语从句;before意为"在…以前"引导时间状语从句;though意为"即使"引导让步状语从句;if意为"如果"引导条件状语从句.根据"____we don't protect the earth"如果我们不保护地球,我们将会没水喝了.在从句中用了一般现在时表示将来的动作,与主句对应,所以要用if来引导条件状语从句.故选D.
点评 首先要明白各个从属连词的不同用法,然后根据具体的题意做出正确选择.
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