【題目】 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】

試題分析：句意為：我認為，在課堂上相互學(xué)習，合作學(xué)習或小組學(xué)習很有必要。though：雖然……但是……，until：直到……才……，unless：除非、如果不，if：假如。根據(jù)語境可知應(yīng)選D。

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