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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
考查名詞性從句的連接詞。_____ worries the doctor most是主語從句，且從句缺少主語，要用what引導，排除B,D; _______ they could find the cause of the disease是表語從句，從句不缺主語和賓語，排除C；缺少狀語，所以選A。
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