about the safety of her son, John’s mother looked upsetA. ConcerningB. ConcernedC. To co

发布时间：2020-08-16 15:50:50

     about the safety of her son, John’s mother looked upset．
A. Concerning
B. Concerned
C. To concern
D. Concern

网友回答

A. Concerning
(答案→)B. Concerned
C. To concern
D. Concern
解析：考查固定短语。人担心什么，通常用sb. be concerned about …的结构，该短语是被动语态结构，已经形容词化。所以选B。
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