We can gain knowledge of the past events by studying history. A. / B. the C. a D. an——青夏教育精英家教网—

摘要： We can gain knowledge of the past events by studying history. A. / B. the C. a D. an

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We can gain _______ knowledge of the past events by studying history.

A. /　 B. the　 C. a　　 D. an

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