题目内容
17．You'll fail your next English exam _______ you work harder from now on．（ ）| A． | if | B． | whether | C． | until | D． | unless |
分析 你下次英语考试会考砸的，除非你从现在开始更努力地学习．
解答 答案：D；if如果；whether是否；until直到；unless除非；根据句意，"You'll fail your next English exam你下次英语考试会考砸的"和"you work harder from now on你从现在开始更努力地学习"，可知后句是前句的条件，而且是否定的条件；用unless引导，unless=if not；意为"除非，如果不"．故选D．
点评 细读所提供的选项，认真分析它们的不同含义，然后在理解句意把握语境的基础上，选择正确的答案．
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