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______ about the missing boy’s safety,  the police stepped up their search.
A.ConcerningB.ConcernedC.Being concernedD.Concern
B
考查concern用法。Concerning关于;be concerned about担心…;本题是形容词短语做原因状语。句意:因为担心失踪孩子的安全,警察们加快了搜查的进度。
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