状语从句有时间、地点、原因、目的、结果、条件、方式、比较和让步状语从句，共9种，是每年必考的语法项目，主要考查连词的判断选用，主句与从句谓语动词的时态运用。其中，以对时间状语从句、条件 状语从句、让步状语从句和结果状语从句的考查最为频繁。近几年，重点考查的连词有：when，while，as，before，unless，however等。近三年，高考有考查状语从句、宾语从句、名词性从句交叉运用的题型出现。
1．(2013·北京，30)I took my driving license with me on holiday，________I wanted to hire a car.
A．in case B．even if
C．ever since D．if only
2．(2013·湖南，23)You must learn to consult your feelings and your reason________you reach any decision.
A．although B．before C．because D．unless
3．(2013·江苏，28)In the global economy，a new drug for cancer，________it i s discovered，will create many economic possibilities around the world.
A．whatever B．whoever C．wherever D．whichever
