_____ about the safety of her son, John’s mother looked upset．
A．ConcerningB．ConcernedC．To concernD．Concern
B
考查固定短語(yǔ)。人擔(dān)心什么，通常用sb. be concerned about …的結(jié)構(gòu)，該短語(yǔ)是被動(dòng)語(yǔ)態(tài)結(jié)構(gòu)，已經(jīng)形容詞化。所以選B。
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