be found+done, 句中were found hidden意为“被发现藏在……”, dead adj. 表示“主语所处的状态”。 17. In his victory speech, ______ before a huge crowd of his supporters, Obama declared that “Change has come to America. ” A. having delivered

　　B. to be delivered C. delivering

　　D. delivered 【解析】选D。考查非谓语动词。deliver与speech在逻辑上是动宾关系, 而且由句意可知此动作已经发生, 故用过去分词, 相当于which was delivered before a huge crowd of his supporters。 18. Carbon dioxide ______ from burning fuels is the most common of the so-called greenhouse gases.

　　A. producing

　　B. having been produced C. to be produced

　　D. produced 【解析】选D。考查非谓语动词。因为carbon dioxide和produce之间是动宾关系, 所以用过去分词表被动。 19. —I’m really hungry now.

　　—That’s because you have left your lunch ______ .

　　A. untouching

　　B. to be untouched C. untouched

　　D. being untouched 【解析】选C。考查非谓语动词。句意为：——我现在真的很饿。——那是因为你没吃午饭。lunch与untouch之间为被动关系, 并且untouch动作已发生, 故用过去分词作宾语补足语。 20. Michael knew he would certainly get ______ if he was late home.

　　A. shout at

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