about her son’s future the mother has been sleeping very badly these months.A. Concerning

问题补充：

about her son’s future, the mother has been sleeping very badly these months.

A. Concerning

B. Concerned

C. To concern

D. Having concerned

答案：

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。