What worried the child most was____to visit his mother in hospital.A.his not being allowed B.having not been allowed为什么一定要加his?什么情况下可以不用加his?

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What worried the child most was____to visit his mother in hospital.A.his not being allowed B.having not been allowed为什么一定要加his?什么情况下可以不用加his?
What worried the child most was____to visit his mother in hospital.
A.his not being allowed B.having not been allowed
为什么一定要加his?什么情况下可以不用加his?

What worried the child most was____to visit his mother in hospital.A.his not being allowed B.having not been allowed为什么一定要加his?什么情况下可以不用加his?
这里选A,用his和后面的not being allowed作为一个动名词组.等于What worried the child most was that he was not allowed to visit his mother in hospital.
B是错误的,因为这里没有完成时的意思,所以不能用having.

这个孩子最担心的was____to探望住院的母亲。
A.他不被允许 B.有不被允许