______ 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關(guān)于；be concerned about擔(dān)心…；本題是形容詞短語做原因狀語。句意：因為擔(dān)心失蹤孩子的安全，警察們加快了搜查的進(jìn)度。
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