问题补充：
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. Concerning
B. Concerned
C. To be concerned
D. Concern
答案：
A. Concerning
(答案→)B. Concerned
C. To be concerned
D. Concern
解析：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。
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