about her son’s future, the mother has been sleeping very badly these months.
A. Concerning
B. Concerned
C. To concern
D. Having concerned
网友回答
A. Concerning
(答案→)B. Concerned
C. To concern
D. Having concerned
解析：考查非谓语动词。句意：担心她儿子的未来，那位妈妈几个月以来都没有睡好觉。concerning关于；sb be concerned about...关心/担心......，是固定搭配；相当于sb be worried about...。非谓语的逻辑主语是the mother，故用concerned。故选B。