You should A check the air in the B tires C as you start D on a long automobile trip.

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问题 You should A check the air in the B tires C as you start D on a long automobile trip.

选项 A、 
B、 
C、 
D、 

答案C

解析 应改为before,根据句子意思和逻辑关系可知从属连词应用before。本句的意思是:“在你开始一段长的汽车旅行之前,你应该检查一下轮胎中的气。”
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