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高中英语,求详细解题步骤谢谢!

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高中英语,求详细解题步骤谢谢!
6) Corn originated in the New World and thus was not known in Europe until Columbus found it ____ in Cuba. A) being cultivated B) been cultivated C)having cultivated D) cultivating
7) ____in this way, the situation doesn't seem so disappointing. (CET-4 2000,1)
A) To look B) Looking at C) Looked at D) To be looked at
8) You will see this product ____ wherever you go. (CET-4 2000,6)
A) to be advertised B) advertised C) advertise D) advertising
9) ____in a recent science competition, the three students were awarded scholarship totaling 21,000 dollars. (CET-4 2000,12)
A) To be judged the best B)shavingsjudged the best C) Judged the best D) Judging the best
10) From the dates ____ on the plates, we decided that they were made in Song Dynasty.
A) marking B)having been marked C) marked D) to be marked
高中英语,求详细解题步骤谢谢!
做非谓语动词题目的经典思维方式:一、确定空格处是谓语动词还是非谓语动词;二、如果是非谓语动词,要看它与逻辑主语是主动关系还是被动关系;三、看时间:过去的用过去式,现在的用进行式,将来的用不定式.
另外,非谓语动词如果作状语,它的逻辑主语就是句子的主语;如果作定语,它的逻辑主语就是它所修饰的名词;如果作宾语补足语,它的逻辑主语就是宾语.
6.A cultivate在句子中作宾语补足语,故其逻辑主语是it,即corn.corn和cultivate是被动关系,排除C、D;B项不全,应当是having been cultivated.
7.C look at在句子中作方式状语,故其逻辑主语是the situation,两者是被动关系,排除A、B;look at不是将来的时间,排除D.
8.B advertise在句子中作宾语补足语,与它的逻辑主语product是被动关系,排除C、D;advertise不是将来的动作,排除A.
9.C judge在句中作状语,与逻辑主语the three students是被动关系,排除B、D;动作不是将来发生的,排除A.
10.C mark在句中作定语,修饰dates,它与dates是被动关系,排除A;mark是过去发生的动作,排除D;having been done有时与done可以互换,但前者更强调动作是在过去发生的,且发生过多次,根据这一分析,排除B.