____about her son's safety,she made several calls as well as sending him some messages.
问题描述：
____about her son's safety,she made several calls as well as sending him some messages.
A.Concerning
B.Concerned
C.Having concerned
D.To concern
求详解
答
选B,这道题中有个固定短语be concerned about,题目中用concerned,就是用形容词做状语.