11.Tom is very short now.His mother wishes that he ____ be t

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11.Tom is very short now.His mother wishes that he ____ be tall when he grows up.A.could B.should C.would D.were able to the answer is C ,but i have not understood up to now ,if i had chosen ,i would choose A and Band C.why are b and c wrong would should could might +V原不是么

1在请求时,没区别
如 Could you go with me? =Would you go with me?
2在表示习性时,不用could ,用 would
Ipushed the door, but it wouldn't open.
我用力推门却推不开．
3could用在wish的句型中：
I wish I could go to the Moon.
4 would ,could 都可以用在带if条件句的虚拟语气主句中,意思大致不变．
If I had a lot of money, I would/could buy a set of house in Beijing.
5 表示推测时,不用would
She could have gone to the cinema .(她可能看电影去了）
http://wenwen.sogou.com/z/q256945805.htm虚拟语气详解

11.Tom is very short now.His mother wishes that he ____ be t Tom is very short now.His mother wishes that he ________ be 英语语法题：Tom is very short now. His mother wishes that he _____ 英语语法Tom is very short now.His mother wishes that he _____C__ Tom is very short now,.His mother wishes that he____be tall 英语试题.求讲解.虚拟语气部分试题.1.Tom is very short now.His mother wishes now he is ____ that he didn't study. Tom is very a____of his mother. is,his,that ,mother,he,no,isn't Jimmy 【used to】【be】a short boy ,but now he is 【tall 】【in】his Tom is very happy now,because he has his o_____ computer Tom is going s填什么?with his mother now