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_____ 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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