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【题目】_____ reading may take up too much of your time, it is very helpful in raising your grades efficiently.

A. Because

B. As

C. Once

D. While

【答案】D

【解析】阅读也许会会占用你很多的时间对有效地提高你的成绩很有帮助之间应该是让至.步关系,所以用while引导让步状语从句,表示尽管之意。A和B项表示原因;C表示时间,都不符句意。

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