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    精英家教网 > 高中英语 > 题目详情
    19．Our class will go to the National Park next Sunday--________ it rains，of course．（　　）
    A．whenB．unlessC．forD．whether

    分析 我们班下周日将会去国家公园．--当然如果下雨就不去了．

    解答 答案：根据it rains，of course可知如果下雨就不去了，所以答案是B unless"除非，如果不"．其他选项的含义分别是A"当…时"；C"因为"；D"是否"．

    点评 考查从属连词．unless是从属连词，引导条件状语从句，含有否定意义，相当于if条件状语从句的否定形式．所以unless=if not．注意：unless引导的条件状语从句和if条件状语从句，与其它时间状语从句一样，用一般现在时代替将来时．

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