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各位来看看Sat语法BecauseEarth'sgravityisgreaterthantheMoon's,theenergyexpendedintravelingfromEarthtotheMoonisgreaterthanthatoftravelingintheopposite.请问这句话后半句比较对象怎么错了?

题目详情
各位来看看Sat语法
Because Earth's gravity is greater than the Moon's,the energy expended in traveling from Earth to the Moon is greater than that of traveling in the opposite.
请问这句话后半句比较对象怎么错了?
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答案和解析
应该是is greater than that expended in traveling in the opposite.原句根本就没有所有格,比较对象当然不能是所有格了