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aid support guidance backing?

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aid support guidance backing?
most customer sevice provision is carried out by personal account managers based in local branches,together with __________staff at company headquarters.
1aid
2support
3guidance
4backing
我1 2 3三个选项都不太清楚 请帮我分析下
正确答案是2
aid support guidance backing?
后半句的意思是在公司指挥部全体员工的支持下,支持就是support,aid是帮助,guidance是指导,backing也是支持的意思,但是此处有with,和support搭配正好.