Question

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

—She has been suffering a serious disease.

A．why B．what C．when D．where

Answer 1

【答案】A

【解析】句意：——我想知道为什么玛丽改变了这么多。——她患了重病。分析句子，空格后面是从句，且根据答语可知应该选why。