题目内容

We’d better not keep the lights______ when we have PE classes outside.
A．off B．onC．open D．closed
B

试题分析：句意：当我们在外面上体育课时，我们最好不要保持灯开着。keep sth on保持…开着。on 介词在这里作特殊用法相当于形容词，开着的。故选B.
点评：on 的特殊用法在中学英语中要进行了解，如下：1.继续 如：They talked on until midnight. 他们一直谈到深夜。 2.向前3.穿上,盖上,连接上It's cold today. Why don't you put your overcoat on? 今天很冷。为什么不把大衣穿上? 4.(机器)处于工作状态;开着;通着He left the engine on while waiting for Joe. 他在等候乔时让汽车引擎开着。 5.上演着;在进行中
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