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

  A. when      B. how      C. whether      D. why

What the doctors really doubt is__________my mother will recover from the serious disease soon.

A.when                B.how                   C.whether              D.why?

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

A．when 

B．if

C．whether 

D．what

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

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

A．when    B  how         C  whether    D  why