In my opinion, it is important that the water (clean) ______before we use it.

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问题 In my opinion, it is important that the water (clean) ______before we use it.

选项

答案be cleaned

解析 当表示“必要的”,“可能的”,“重要的”等含义的形容词出现在It is/was+形容词+that的主语从句中时,从句部分需要用(should) +动词原形。又因为"water"与clean之间是一种被动的关系,所以用 (should) be cleaned,should常常可以省略。具有相同用法的常见形容词还有necessary,(im)possible, essential,vital等。
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