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英语语法单选题What worried the child most was _____ to visit his mo

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英语语法单选题
What worried the child most was _____ to visit his mother in the hospital.
A. his not allowing B. his not being allowed
C. his being not allowed D. having not been allowed.
答案是B.我想问其它选项错在哪里.
谢谢!
本题考查分词:
1.分词否定是在分词前加not;
2.分词的逻辑主语是在分词前加所有格(my father's,Jack's等),或形容词性物主代词(his,my等)
3.注意分词的被动形式.
4.上述三个语言现象同时出现的时候,是my not going to shcool;My dad's not being invited to the party等
再问: 能否结合一下选项。ac为什么错?d我知道了,是因为分词否定是在分词前加not。
再答: A 是没有被动啊——题目的意思是“不被允许” C 是否定的位置错误。——v-ing的否定是not在前面。比如: I look forward to not being forced to go to shool.注意本句的to是介词