Industrial managers employ specialists to keep machines working properly and to ______ the supply of spare parts.

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问题 Industrial managers employ specialists to keep machines working properly and to ______ the supply of spare parts.

选项 A、ensure
B、promise
C、guarantee
D、assure

答案A

解析 ensure保证，让人觉得安全可靠，有保障；promise与assure相似，让人踏实放心，但不承担责任和义务；guarantee担保，保证，表示对某一产品或服务承担责任和义务；assure郑重宣告，使人确信。

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