高中英语语法题,
原题：The hotel( )during our holidays stands by the seaside
A：we stayed B:where we stayed at C:we staded D:in the stayed
标准答案是选A为什么不能选B,请指教.
原题：The boy ( )the old man's grandson is very lovely
A:who I think is B:whom I think is C:who I think it is D:who I think
原题：The man,with( )son I worked,looked down upon women
A:whom B:who C:whose D:his
为什么选A,
原题：People are animals (who A) (needs B) depend on (what C) they have already had and only those needs that (have not been satisfied D) can affect their action
这是个远错题,望高手不吝赐教.