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    【题目】 I think that studying in pairs or groups is necessary____you want to learn from each other in class.

    A. though B.until C.unless D.if

    【答案】D

    【解析】

    试题分析：句意为：我认为，在课堂上相互学习，合作学习或小组学习很有必要。though：虽然……但是……，until：直到……才……，unless：除非、如果不，if：假如。根据语境可知应选D。

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