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1.It is OK to leave an electrical appliance on so long as you are using it-,_______,turn it off to save energy.(  )
A.if necessaryB.if everC.if notD.if any

分析 只要你使用电器,让它开着是对,如果不使用,关掉它以节省能源.

解答 答案:C 根据"只要你使用电器,让它开着是对",及"关掉它以节省能源",应是"如果不使用",if not=if it is not used的省略形式.故选C.if necessary如必要的话;if ever很少,难得;if any若有的话.

点评 解答此类问题,要弄清楚省略的部分是单词,短语还是句子,熟悉一些常用的省略表达,然后根据题意和上下文选择最合适的答案.

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