Virtually all (parts moving) of an automobile (need to be) lubricated (because), without lubrication, friction (would increase)

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问题 Virtually all (parts moving) of an automobile (need to be) lubricated (because), without lubrication, friction (would increase) power consumption and damage the parts.

选项 A、parts moving
B、need to be
C、because
D、would increase

答案A

解析
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