In order to______the life of the machine, regular maintenance is required every month.

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问题 In order to______the life of the machine, regular maintenance is required every month.

选项 A、insist
B、endure
C、persist
D、prolong

答案D

解析词汇：动词1．这是一道词汇题，选项均为动词。2选项中the life of the machine作宾语，从语意上看应选择D选项prolong。

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