国家开放大学 / 综合英语（1）
正确率：100%
In paragraph 4, “a fruitless search” means _ _ _ _ .
a.an effort with no results
b.research on fruitless diets
c.a diet used as medicine
d.a search for a diet without fruits
a.an effort with no results
b.research on fruitless diets
c.a diet used as medicine
d.a search for a diet without fruits
参考答案：
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