What the doctor really doubts is ______ my mother will recover from the serious disease soon.
A．when B．how C．whetherD．if
C

試題分析：考查表語從句：句意：醫(yī)生真正懷疑的是是否我媽媽會從重病中迅速恢復。Is后面是表語從句根據(jù)句意是“是否“，但if不能連接表語從句，用whether。選C。
點評：表語從句的考查主要的考查陳述語序和連接詞的詞義辨析。要根據(jù)句意和成分判斷選擇連接詞，如果不缺成分，就是用that，缺少主賓表，用what連接表語從句，語序要變成陳述句。
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