5.The patient was warned ______ oily food after the operation.
A.to eat not B.eating not C.not to eat D.not eating
析:根据warn sb.(not)to do sth.句式,可排除B、D两项;又根据非谓语动词的否定式not总是在首位的规律,又可排除A,而定C.
6.——I usually go there by train. ——Why not ______ by boat for a change?
A.to try going B.trying to go C.to try and go D.try going
析:此题可根据why not后直接跟原形动词规律而一举确定正确答案为D.若将B项改为try to go,则要根据其与try going意义之别来确定答案.依据题干对话内容,乙方是建议甲方尝试乘船变变花样,所以答案仍为D.
7.______ a reply,he decided to write again.
A.Not receiving B.Receiving not
C.Not having received D.Having not received
析:非谓语动词的否定式not应置于首位,B、D皆为错误形式.A项不能表达先于decided的动作,只有选C项才表没收到信在先,决定再写信在后,所以C为正确答案.
8.Charles Babbage is generally considered ______ the first computer.
A.to invent B.inventing C.to have invented D.having mvented
析:consider表"考虑"意时,其后动词用doing形式,此处不表"考虑",而表"认为",这时consider后作宾语补足语或主语补足语多为to do,to have done,to be等形式.据此可排除B、D两个选项.又因A表"要发明"意,不合题用,只有C表"发明了"意,才合题用,故选C.
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