______ a car reaches the end of its life, it is taken apart and any part that can be reused is sold off.

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问题 ______ a car reaches the end of its life, it is taken apart and any part that can be reused is sold off.

选项 A、As
B、With
C、Once
D、While

答案C

解析 前句是后句的前提条件,所以要用能引导条件从句的引导词Once。
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