_____ about the safety of her son, John’s mother looked upset．


  1. A.
    Concerning
  2. B.
    Concerned
  3. C.
    To concern
  4. D.
    Concern
B
解析：
考查固定短語。人擔心什么，通常用sb. be concerned about …的結(jié)構(gòu)，該短語是被動語態(tài)結(jié)構(gòu)，已經(jīng)形容詞化。所以選B。
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