】He cleaned the old machine and ________ the moving parts with a little mineral oil, hoping that it could work again. A、 lubrication B、 lubricant C、 lubricated D、 lubricator

】He cleaned the old machine and ________ the moving parts with a little mineral oil, hoping that it could work again.
A、
lubrication

B、
lubricant

C、
lubricated

D、
lubricator

出自：河北农业大学大学英语Ⅳ

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