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

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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