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 只要你使用電器，讓它開著是對(duì)，如果不使用，關(guān)掉它以節(jié)省能源．

解答 答案：C 根據(jù)"只要你使用電器，讓它開著是對(duì)"，及"關(guān)掉它以節(jié)省能源"，應(yīng)是"如果不使用"，if not=if it is not used的省略形式．故選C．if necessary如必要的話；if ever很少，難得；if any若有的話．

點(diǎn)評(píng) 解答此類問題，要弄清楚省略的部分是單詞，短語還是句子，熟悉一些常用的省略表達(dá)，然后根據(jù)題意和上下文選擇最合適的答案．

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