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We should turn off the lights ________ w...

We should turn off the lights ________ we leave the room.

A.where B.while C.as soon as

 

C 【解析】 句意:我们一离开房间就应该关灯。 考查连词的用法。where(在)……的地方。while当……时候,只指“时间段”,不指“时间点”,从句的动词只限于延续性动词。as soon as一…就…,主句用将来时或情态动词或祈使句,则从句必须用一般现在时代替将来时。已知主句动作“turn off the lights”和从句动作“leave the room”几乎同时发生,且leave是非延续性动词,所以题干应用as soon as连接。故选C。  
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