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（讲）-2017年高考英语一轮复习讲练测（原卷版） 状语从句 一考点梳理。 1.考查in case引导的状语从句 根据语境的不同，in case既可表示“如果”、“万一”，引导条件状语从句：也可表示“以防（万一）”，引导目的状语从句。 【例】 Leave your key with a neighbor____you lock yourself out one day. A. ever since B.even if C.soon after D. in case 答案为D。in case在此引导目的状语从句。句意为：给你的邻居留一把钥匙，以防哪天你把自己锁在外面。 【例】My parents live in a small village. They always keep candles in the house__there is a power cut. A. if B.unless C.in case D. so that 答案为C。in case在此引导目的状语从句，意为“以防”。 2.考查before引导的状语从句 尤其要注意“It+be+--段时间+before...”这一句型。 【例】 The field research will take Joan and Paul about five months; it will be a long time____we meet them again. A. after B.before C.since D.when 【例】He was told that it would be at least three more months____he could recover and return to work. | 
