A. to clean B. cleaned C. clean D. cleans(甘肃省)
2. It's hard for us _________ English well.
A. learn B. learns C. to learn D. learning(江西省)
3.建造这座立交桥将花费工人们一年多的时间。
It will _________ the workers over a year _________ _________ the flyover.(北京市海淀区)
4. It's very nice _________ you to get me two tickets _________ the World Cup.
A. for, of B. of, for C. to, for D. of, to(安徽省)
Keys: 1. A 2. C 3. take, to, build 4. B
[简析]动词不定式作主语时,可以直接放在谓语动词前面的主语位置,也可以用先行词it作形式主语,而将真正的主语(不定式)置于后面。常见的句式有:(1)It is +形容词(of sb)to do sth.(2)It is +名词(for sb)to do sth.(3)It takes sb some time to do sth.(4)It is +形容词(for sb)to do sth.句式(1)中常用nice, kind, clever, good, right, wrong, foolish, careless等形容词,与介词of搭配,这些形容词常表述不定式逻辑主语的属性或性质;句式(4)中常用hard, difficult, easy, important等形容词,与介词for搭配,表示不定式表示的动作、行为的性质。
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