摘要:引导条件状语从句的从属连词有if ,unless(=if -not如果不--.除非).as/so long as ,while.supposing,provided/providing.on condition that等.如: [考例] you go to bed earlier, you won't feel tired in the mornings.[沈阳市] A. Unless B Because C.If D.When [答案]C .[解析]考查if引导的条件状语从句.“假如你早一点上床睡觉.那么你在上午就不会感到累. You won't pass your exams you work harder. [广东省] A. when B. if C. unless D. after [答案]C .[解析]when.after一引导的是时间状语从句.不合题意,if.unless引导的是条件状语从句.If不合句意.“除非你更加努力地学习.否则.你不会通过考试 .故用unless.

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