题目内容

_____ worries the doctor most was _______ they could find the cause of the disease.
A．What; howB．That; that
C．What; whatD．How; what
A
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。
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