2. 外语
  3. _____________ (应当注意的是) that pollution has become one of the thorniest problems in many big cities.

_____________ (应当注意的是) that pollution has become one of the thorniest problems in many big cities.

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问题 _____________ (应当注意的是) that pollution has become one of the thorniest problems in many big cities.
选项
答案It should be taken into consideration
解析 一见到类似“应当注意的是…”的句子，就应该想到形式主语句型(It should be．．．)，it的具体内容用that从句表示即可。
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大学英语四级

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