____________ (应当注意的是) that pollution has become one of the thorniest problems in

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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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