________ 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．WarnedB．Having warned
C．WarningD．Being warned
A
A 考察非謂語(yǔ)動(dòng)詞。句義：自從被警告以后，青奧會(huì)可能會(huì)因?yàn)閲?yán)重的空氣污染而推遲舉行，我們的政府將羅格保證，他們將不遺余力地去解決這個(gè)問(wèn)題。本題是非謂語(yǔ)動(dòng)詞做狀語(yǔ)，由于warnYu our government構(gòu)成被動(dòng)關(guān)系，使用過(guò)去分詞的形式。故A正確。
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