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Youshouldinspectthewheelsregularly,andreplacethem

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问题详情:

Youshouldinspectthewheelsregularly,andreplacethem

You should inspect the wheels regularly, and replace them ______ they cause you trouble.

   A. while                      B. when                    C. before             D. Until

【回答】

C

知识点:连词

题型:选择题

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