题目内容
14．-David，turn off the TV no one is watching it．-But it off ten minutes ago!The music is from the radio．（ ）
| A． | so that； has been turned | B． | when； turned | ||
| C． | if； was turned | D． | because； is turned |
分析 --David，如果没有人在看电视，就把它关了吧．
--但是10分钟之前就关闭了，音乐来自收音机．
解答 答案：C．
联系语境并根据前后句子的对比，推测句意是"--David，如果没有人在看电视，就把它关了吧．--但是10分钟之前就关闭了，音乐来自收音机．"，第一个设空处句子表示主句的条件，所以用if引导条件状语从句．第二个设空处结合ten minutes ago判断用一般过去时的被动语态，构成是was/were+动词的过去分词，故选C．
点评 本题主要考查连词的用法，连词在句子中主要起联系上下文的作用，他们之间的区别就是表示逻辑关系的不同，所以在解题时先要理解上下文含义，然后根据上下文逻辑关系选择合适的连词．连词的用法都比较多，语义之间还有交叉，熟记其基本应用规则，了解其区别，注意固定搭配对象，是做好此类题型的关键．
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