【題目】【2012河北】Studying in groups is necessary______ you want to do well in school.

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

【答案】A

【解析】

試題分析：if 引導(dǎo)的條件狀語從句，意思是“如果”，until“直到..時(shí)”，引導(dǎo)時(shí)間狀語從句，unless"除非”= if not,though"盡管”引導(dǎo)的是讓步狀語從句，根據(jù)句意，只能選A.

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