题目内容
17.There will be no going back_____our decision is made.( )A. | once | B. | unless | C. | until | D. | before |
分析 一旦我们做出决定,就不能再回头了.
解答 答案A.once意思是"一旦,如果"时,引导条件状语从句;unless"除非",在意义上相当于if…not,因此在有些场合中unless与if…not可互换使用,引导条件状语从句;until"直到",引导时间状语从句; before"在…之前",引导时间状语从句.分析可知前后两句话的关系是逻辑上的条件关系,可排除C和D两项;再根据句子所表达的意思可排除B项,故答案选A.此题C项干扰性比较强,有同学会把它看作是"not…until…"句型,但是翻译一下句子,会发现句子的意思不通顺,因此C不正确.
点评 本题考查从属连词的用法.连词的用法辨析,要注意分析主从句之间的逻辑关系,再确定相应的连词,同时注意不同的连词的语义及用法区别.
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