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【题目】【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】

试题分析:if 引导的条件状语从句,意思是“如果”,until“直到..时”,引导时间状语从句,unless"除非”= if not,though"尽管”引导的是让步状语从句,根据句意,只能选A.

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