Many big cities in the world__________( 正面临着淡水资源短缺的问题).are facing the problem of

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问题 Many big cities in the world__________( 正面临着淡水资源短缺的问题).

选项

答案 are facing the problem of lack/shortage of water resources

解析 ①现在进行时态；②“短缺”lack/shortage；③“淡水资源”water resources。

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