_____ about the safety of her son, John’s mother looked upset．A．ConcerningB．Conc_刷题宝

题干

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

A．Concerning

B．Concerned

C．To concern

D．Concern

上一题下一题 0.64难度单项选择更新时间:2011-01-11 03:48:25

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