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

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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