the doctors really doubt is my mother will recover from the serious disease soon.A. What

问题补充：

the doctors really doubt is my mother will recover from the serious disease soon.

A. What; when

B. That; how

C. What; whether

D. That; what

答案：

A. What; when

B. That; how

(答案→)C. What; whether

D. That; what

解析：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。