With the population to the environment, the world ()a crowded and unpleasant place to live in.

科目名称：理工英语3

试卷号：11377

题型：词汇与结构(单选题)

题目：With the population to the environment, the world ()a crowded and unpleasant place to live in.

选项：A. has become B. become C. became

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答案：A. has become