Sonja Lyubomirsky bought the car just because she wanted to own a Prius. Because little research had been done on the explanati

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问题 Sonja Lyubomirsky bought the car just because she wanted to own a Prius.
Because little research had been done on the explanation of happiness, before going into the lab, Lyubomirsky had done some ______.

选项

答案groundwork

解析由题干中的Before going into the lab定位到第三个小标题下第2段首句So Lyubomirsky had to lay some groundwork before she could go into the lab．此处需要填入名词性成分。题干中的lay与原文中的do属同义转述。因此答案应该为groundwork。

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大学英语六级

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Sonja Lyubomirsky bought the car just because she wanted to own a Prius. Because little research had been done on the explanati

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