The population of many big cities ______ (double) in the past three years.

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问题 The population of many big cities ______ (double) in the past three years.

选项

答案has doubled

解析句意：过去三年许多大城市的人口翻了一翻。强调对目前造成的影响和结果。

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大学英语三级A级

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