题目内容
【题目】What Tom’s parents really doubt is ________ he will recover from the serious disease soon.
A. that B. when
C. whether D. how
【答案】C
【解析】考查表语从句。句意：让汤姆的父母真正怀疑的是他是否能很快从重病中康复。分析句子可知C项（ whether是否）正确。
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题目内容
【题目】What Tom’s parents really doubt is ________ he will recover from the serious disease soon.
A. that B. when
C. whether D. how
【答案】C
【解析】考查表语从句。句意：让汤姆的父母真正怀疑的是他是否能很快从重病中康复。分析句子可知C项（ whether是否）正确。