. What the doctors really doubt is ______ my mother will recover from the serious disease soon.
A．when B．how C．whether D．why
C
考查用法。doubt用于肯定句時(shí)用whether引導(dǎo)同位語(yǔ)從句；用于否定句時(shí)，用that引導(dǎo)。根據(jù)可知本句為肯定句，故選C。
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