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Laboratory rats and mice live up to 40 percent longer than usual when fed a diet of at least 30 percent fewer calories than that which they would normally eat, but that otherwise contains all necessary vitamins and nutrients.
A. of at least 30 percent fewer calories than that which they would normally eat, but that otherwise
B. with at least 30 percent fewer calories than what they would normally eat though otherwise it
C. that has at least 30 percent fewer of the calories that they would normally eat, but otherwise it
D. that has at least 30 percent fewer calories than they would normally eat but that otherwise
E. that has at least 30 percent fewer calories than that which they would normally eat, though that otherwise
答案是D,我想知道
1)为什么than后面可以省略比较对象diet,也不用加代词
我可以把that加上吗? that has at least 30 percent fewer calories than that they would normally eat but that otherwise
2)OG解释说E的that 会指代到 calories :The singular relative pronoun that nonsensically refers to the plural calories
不是很能理解为什么
求大神解释!!谢谢
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