【题目】What the doctors really doubt is _________ my mother will recover from the serious disease soon.
A. when B. how C. whether D. why
在线课程【答案】C
【解析】
试题分析：考查连词。doubt意为“怀疑”，是不确定的。后面有soon，就不应再提问when。句意：医生真的怀疑我妈妈是否很快能从严重的疾病中恢复过来。C项whether“是否”符合语境。
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