that the Youth Olympic Games might be delayed due to severe air pollution, our government has made a promise to Jacques Rogge that they will spare no effort to settle the problem.
A. Warned
B. Having warned
C. Warning
D. Being warned
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(答案→)A. Warned
B. Having warned
C. Warning
D. Being warned
解析：A 考察非谓语动词。句义：自从被警告以后，青奥会可能会因为严重的空气污染而推迟举行，我们的政府将罗格保证，他们将不遗余力地去解决这个问题。本题是非谓语动词做状语，由于warnYu our government构成被动关系，使用过去分词的形式。故A正确。