What are the three partner benefits of service contracts?（）
A. renews automatically for the lifetime of the product
B. eliminates network problems
C. generate recurring revenue
D. helps customers speed architectural planning and design
E. produces higher margins than product sales along
F. strengthens customer loyalty
车辆费用的管理：定点加油、定点维修、（）。
A. 定点保险
B. 定点保养
C. 任意保险
D. 任意保养
Such changes can alter the social structure,（）people to move.
A. which leading
B. leads
C. which led
D. leading
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