In order to carry out our plan better,we should think all____he says A what B which C that D who
问题描述：
In order to carry out our plan better,we should think all____he says A what B which C that D who
为什么选C而不选A
答
C 如果 后半句改为we should think about _he says.就要用A.
但是这个句子里all引导的是that从句.所以必须C.