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

試題分析：句意：當(dāng)我們?cè)谕饷嫔象w育課時(shí)，我們最好不要保持燈開(kāi)著。keep sth on保持…開(kāi)著。on 介詞在這里作特殊用法相當(dāng)于形容詞，開(kāi)著的。故選B.
點(diǎn)評(píng)：on 的特殊用法在中學(xué)英語(yǔ)中要進(jìn)行了解，如下：1.繼續(xù) 如：They talked on until midnight. 他們一直談到深夜。 2.向前3.穿上,蓋上,連接上It's cold today. Why don't you put your overcoat on? 今天很冷。為什么不把大衣穿上? 4.(機(jī)器)處于工作狀態(tài);開(kāi)著;通著He left the engine on while waiting for Joe. 他在等候喬時(shí)讓汽車引擎開(kāi)著。 5.上演著;在進(jìn)行中
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