2. 外语
  3. ______a car reaches the end of its life, it is taken apart and any part that can be reused is sold off.

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

admin2014-10-11  57
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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