Without facts, a person can not form a correct opinion, for he needs to have actual knowledge ______his thinking .

A．on which to be based

B．on which to base

C．which to be based

D．which to base

目前国内常用的失语检查法为（）

A.波士顿失语检查法

B.西方失语检查套表

C.汉语失语检查法

D.双语和多语失语检查

E.Wechslre智力表