_____ worries the doctor most was _______ they could find the cause of the disease
A.What; how
B.That; that
C.What; what
D.How; what
网友回答
A解析考查名词性从句的连接词。_____ worries the doctor most是主语从句，且从句缺少主语，要用what引导，排除B,D; _______ they could find the cause of the disease是表语从句，从句不缺主语和宾语，排除C；缺少状语，所以选A。