题目内容

_____ the doctors really doubt is _____ my mother will recover from the serious disease soon.
A．What; whenB．That; howC．What; whetherD．That; what
C

试题分析：考查主语从句和表语从句，what引导主语从句，从句中缺少宾语，第二空考查表语从句的连接词，句意：医生真正怀疑的是，是否我妈妈会从重病从恢复。所以用whether引导定语从句，选C。
点评：分析主语从句和表语从句时，关键在于结合句意看从句缺什么成分，若不缺成分，使用连接词that（无任何含义）, wether(是否),若缺少主宾，表，定语，则使用连接代词what, which, who, whatever,....若缺少状语，则使用连接副词how,where,when,why,
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