-Don't leave your computer if you don't use it．Electricity is valuable．-Sorry.I won't．( )A．onB．outC．off 题目和参考答案——青夏教育精英家教网—

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20．-Don't leave your computer_____ if you don't use it．Electricity is valuable．
-Sorry，I won't．（　　）

A．

B．

out

C．

off

分析 --如果你不用电脑了，不用让它开着，电是宝贵的．
--抱歉，我不会这样了．

解答答案：A．
结合语境可以推断这句话表达的意思是"如果你不用电脑了，不用让它开着，电是宝贵的．"，所以设空处的介词短语表达的意思是"让电脑开着"，应该用on，故选A

点评英语介词的一个特点是一词多义，并且介词间语义交叉现象很多，习惯用法也很多，有时很难从词义上区分开来．故学习中要注意不断总结，熟记一些介词和动词的固定搭配用法及习惯用法，是完成此类问题的捷径．

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