2. 外语
  3. Sonja Lyubomirsky bought the car just because she wanted to own a Prius. A large sum of money must be spent on Lyubomirsky’s re

Sonja Lyubomirsky bought the car just because she wanted to own a Prius. A large sum of money must be spent on Lyubomirsky’s re

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问题 Sonja Lyubomirsky bought the car just because she wanted to own a Prius.
A large sum of money must be spent on Lyubomirsky’s research because it needs to trace a lot of people ______.
选项
答案over a long time
解析 由题干中的a large sum of money定位到第三个小标题下第三段首句The research needed to answer questions about lasting happiness is costly, because studies need to follow a sizable group of people over a long time.此处需要补全原因状语从句。题干中的A large sum of money must be spent on与原文中的costly属同义转述；trace a lot of people与原句中的follow a sizable group of people属同义转述，所以答案是over a long time。
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