If you want to study nature of universe, at first you must be clear about the origin of——青夏教育精英家教网—

摘要： If you want to study nature of universe, at first you must be clear about the origin of it. A. 不填, the B. the, 不填 C. the, the D. 不填, 不填

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If you want to study __ nature of __ universe, at first you must be clear about the origin of it.（）

A. /; the　　　　　 B. the; /　　　　　 C. the; the　　　　 D. /; /

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