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【题目】Math is very useful, ________ everyone in our class works hard at it.

A.orB.butC.becauseD.so

【答案】D

【解析】

句意:数学是有用的,因此我们班里每个人都努力学习它。

考查连词辨析。or或者,否则;but但是;because因为;so因此,所以。根据句意可知,这两句话之间是因果关系,前一句是原因,后一句是结果,应用so连接。故选D

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