【題目】What the doctors really doubt is ____________ my mother will recover from the serious disease soon.

A. when B. why

C. whether D. that

【答案】C

【解析】C考查表語從句引導(dǎo)詞。句意：醫(yī)生們真正懷疑的是我母親是否能從嚴(yán)重的疾病中恢復(fù)過來。Is后面的表語從句，從句中已經(jīng)有了時間狀語soon，不需要when，排除A；根據(jù)句意和常識判斷，醫(yī)生不會懷疑“怎么恢復(fù)”和“為什么恢復(fù)”，故排除B和D，故選C。

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