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帮我做到选择题,并说明原因,

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帮我做到选择题,并说明原因,
这是从完形填空里摘下来的一句话
Old people in western countries are generally considered useless,and they are even thought of as a burden on their family.They are hardly held in repect.On the other hand,most of them used to_________work.
A.focusing on B.focus on C.focusing at D.focus at
答案是选A,但我个人认为不是be used to doing表示“习惯于做某事”吗?这里没有be动词,请问下这里used to是做什么解释?
e used to do:被用来做某事
be used to doing:习惯于做某事
used to do:过去常做某事
这题目有问题吧