At present, man’s efforts ______. People flow from the countryside into cities. This happens ______.

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问题 At present, man’s efforts ______.
People flow from the countryside into cities. This happens ______.

选项 A、sometimes
B、all the time
C、frequently
D、now and then

答案B

解析 文章第四段指出,There is a constant flow of people from the country into the cities,其中用了constant一词,意为“不断的,连续发生的”,因此 B.all the time是正确答案。
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