题目内容
15．出门前关灯可以节约用电．People can save electricity byturning off lights before they leave a room．（turn）
分析 turning off
解答 答案：turning off．
首先通过中英文句子的比对，可知英文句子中缺少"关闭"的表达．短语"关闭"的英文表达是：turn off．本题中，根据设空处前面的by判断填动词的ing形式，故答案为：turning off
点评 做这类题型，首先根据所给汉语明确句子所要考查的单词或短语的拼写，再结合相关语法知识对单词或短语做出形式上的变化．
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