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SAT英语语法问题(IS)

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SAT英语语法问题(IS)
13.Astronomy is the study of celestial bodies in outer space,(especially their positions,dimensions,movements,and composition.)
选项 A especially their positions,dimensions,movements,and composition.
选项 C especially studying their positions,dimensions,movements,and composition.
为什么不选c啊?
当然选A了.
逻辑主语题啊.
studying 这个动作只能是人发出的,怎么可能是Astronomy发出的.
所以根本找不到发出study这个动作的主语,当然错啦.
A选项代词指代完全正确