问两个英语单选题1.____is known to us.A.He has a rich father B.His fa

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问两个英语单选题
1.____is known to us.A.He has a rich father B.His father's being rich C.His father being rich D.His father is rich 为什么选B呢?
2.They failed to pass the exam last time; i regretted___
A.being unable to help B.not to be able to help C.to be not able to help D.being not to be able to help
3.English has an alphabet ____ 26 letters.
A.consisting of C.consisted of 帮我区分下这两个选项

1.B
本题考察动名词复合结构,所谓动名词的复合结构就是为动名词加上一个逻辑主语,用one's doing表示.本题里is前面是主语,由动名词复合结构充当,所以选择B.（A是完整的句子,如果想做主语需要在前面加that,构成主语从句充当主语.C中father后面应该加's.D也是完整的句子,改法和A同）
2.A
本题考察regret doing和regret to do的区别,以及不定式和动名词否定的方法,和否定词的位置.首先判断doing还是to do,根据句意可以看出,是对已发生对事情表示遗憾、抱歉,所以用regret doing这个结构（regret to do是为即将做的事情表示遗憾、抱歉）,所以排除B、C.其次,用not否定须放在不定式或动名词的最前面,如果用否定含义的形容词则正常,所以本题由两种答案：being unable to help或not being able to help.D属于结构杂糅,把not去掉可以看出来being to be able to help这个结构,这是不存在的用法.所以选A
3.consist 是不及物动词,所以没有被动（所有不及物动词都无被动）.所以只能用动名词形式做定语.

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