Question

What worried the child most was _____visit his mother in the hospital.

A. his not to be allowed
B. his not being
为什么a不对啊？

Answer 1

首先这里应该填一个名词形式的东西（因为是让他担心的事）
然后his not to be allowed 并不是名词形式而his not being 是动名词
所以选b不选a
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追问

his not to be allowed
那这是什么形式？

追答

不定式 to do

Answer 2

his 后面要接名词

his not being ， being在这里是动名词作为名词使用的

A 的话，要改为 his not being allowed to

Answer 3

his 后面要跟名词性单词或短语，因此not to be 不合适。 not being 合适

Answer 4

A后还应加to .
be allowed to do sth

Answer 5

his not being allowed to
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