Question

______about the safety of her son who had been missing for a week,the mother .....

______about the safety of her son who had been missing for a week,the mother couldn't sleep every night
Aconcerned Bbeing concerned Cconcerning
为什么选A？concern about不也是关心的意思吗？为什么不选C？
若是be concerned about，为什么不选B？

Answer 1

这里应该是用分词填空
肯定不选B，因为B是表被动，“妈妈被担心”的意思，语意不对，排除
同样不选C，本人认为，貌似没有concern about的结构哎……
哦吼吼吼，可能是我没见过吧~~~~~
所以应该是选A

Answer 2

be concerned about是固定词组，若是B的话，是表示进行时，此处是表示担心的状态，构成原因状语从句。

Answer 3

C
在这里作状语从句，表示“时时担心”