Tibet is facing a(n) task to maintain stability and all government workers must be on their highest guard.
A. concerned
B. subtle
C. ridiculous
D. urgent
网友回答
A. concerned
B. subtle
C. ridiculous
(答案→)D. urgent
解析：考查形容词。A. concerned关心的；B. subtle微妙的；C. ridiculous可笑的；D. urgent紧急的。句意：西藏正面临着一个维护稳定的任务，所有的政府人员必须高度警戒。故D正确。