问题
选择题
. What the doctors really doubt is ______ my mother will recover from the serious disease soon.
A．when
B．how
C．whether
D．why
答案
答案：C
考查用法。doubt用于肯定句时用whether引导同位语从句；用于否定句时，用that引导。根据可知本句为肯定句，故选C。
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