【題目】—I wonder ______ Mary has changed so much.

—She has been suffering a serious disease.

A．why B．what C．when D．where

【答案】A

【解析】句意：——我想知道為什么瑪麗改變了這么多。——她患了重病。分析句子，空格后面是從句，且根據(jù)答語可知應(yīng)該選why。

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