Question

【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

Answer 1

【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。