搜题
问题   更新时间2023/4/3 12:59:00

The world’s urban population, increasing at four times the rate of rural populations, will double in the period 1990 - 2025.

The world’s urban population, ____ ____ ____at four times the rate of rural populations, will double in the period 1990 - 2025.

正确答案是:which is increasing
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