题目内容
13．Our head teacher often says，"You will not pass the exam ______ you work hard．"（ ）| A． | if | B． | unless | C． | since | D． | when |
分析 我们的班主任常说："如果你们不努力学习，你们就通不过考试"．
解答 答案：B
A表示如果；B表示除非；C表示自从，因为；D表示当…时．分析句子可知 you work hard与You will not pass the exam是条件关系，由此可判断出这是一个条件状语从句，可用if和unless引导，if表示如果，unless=if not，由常理与句意可知如果不努力学习才是通不过考试的条件，选B．
点评 此题首先要分析句子判断出是条件状语从句，再结合句意选择正确的引导词．
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