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急,以下几题都有答案,但不知道为什么,1 I hope the children won't touch the dog

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急,
以下几题都有答案,但不知道为什么,
1 I hope the children won't touch the dog.
I've warned them _______.
A not B not to C not touch D not do
2 I was walking along the river _______ I heard a cry for help.
A while B since C when D as
答案C(为什么A不可以?while和when有什么区别?)
3 _________ his telephone number,she had some difficulty getting in touch with Bill.
A Not knowing B Knowing not C Not having known D Having not know
4 Go on _____ the other exercise after you have finished this one.
A to do B doing C with D to be doing
答案A(为什么不是C?)
5 ______ you succeed in everything and ____ you be healthy.
A Hope;wish B Wish;hope C May;may D Expect;hope
急,以下几题都有答案,但不知道为什么,1 I hope the children won't touch the dog
1.not to 后省略了touch the dog.
2.while 后的动词要加进行时.
3.分词做主语.
4.go on to do sth.继续做某事.
5.May 开头表示祝愿.