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

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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