______ about the safety of the people in the earthquake-stricken Lushan county in Sichuan Province, Premier Li has flew there to direct the rescue mission.A.ConcerningB.ConcernedC.To be concernedD.Concern
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B解析试题分析：句意：由于担心四川芦山县地震灾区人民的安全,李总理已经飞往那里指挥营救任务。动词不定式表示目的或将来，不符合语境。concern是动词，故排除。这里sb be concerned about关心，担心；这是非谓语动词，故用B。考点：考查非谓语动词的用法。
点评：本题难度适中。主要考查的是非谓语的一些最基本的用法。但是，题目的设置注重了情景化和结构复杂化，加大了考生对题干句的理解难度。即学即练：__________ and short of breath, Andy and Ruby were the first to reach the top of Mount Tai.A. To be tired B. TiredC. Tiring D. Being tired解析：B。考查动词的非谓语形式。句意为：Andy和Ruby首先登上泰山山顶，疲惫不堪，气喘吁吁的。据句子结构分析，空里填的词应与short of breath并列作结果状语，主语是人，因此用过去分词形式tired。