有关于英语单项选择题He sat there doing nothing else -----.A)but to lau

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有关于英语单项选择题
He sat there doing nothing else -----.
A)but to laugh B)than laughing C)but laughed D)than laugh
这道题我选的是A,答案选的是C.一般不是but前有do的时候,后面的动词就用原型吗?但我又记得不用动词不定式的形式,我蒙蒙就选了A了.
There is no mother ------loves her own children.
A)who B)that C)but D)who not
答案选的是C.我选的是D,这里的有but什么意思吗?
I would just as soon-----rudely to the child.
A)you not speak B)you won't speak C)you not speaking D)you didn't speak
这道题选的是D,我是蒙对的.我不太懂结构和意思.
这是大学英语题目,现在老师都不怎么常给学生讲题.希望有大神可以帮我解答,谢谢!~

第一题：
一般but前有do的时候,后面的动词就用原型.但是那个句型是：...do nothing but do sth.
而这一句,在nothing后面有else,所以就不能选A了.
第二题：
考点是but作关系代词.
but 作关系代词总是用于否定句.
句子的意思是：没有哪个不爱自己孩子的妈妈.即,没有哪个妈妈不爱孩子.
另例：There is no one but knows about this matter. (=Everyone knows about this matter.)
第三题：
would just as soon = would rather,后接从句要虚拟,从句的谓语动词用一般过去时.
所以是you didn't speak 正确.

Nothing else but后加doing还是to do There seemed nothing else to do but(to)send for a doctor There seemed nothing else to do but send for a doctor. 一道英语选择题：There was nothing in the room but a ____ chair. do nothing but do there is nothing to do but do/doing用哪个?举例说 there was nothing else he could do. he sat there with nothing __ except play with her cat.doing He sat there for a lpng time without doing--- He sat there for a long time w___ doing anything he wanted nothing but----there. RT,-----------------,there was nothing else to do 有关于大学英语的单项选择题的问题,求助!