答案：D

题目分析：impression印象；advice建议；attention注意；effect影响。have effect on的变形。原句：His

speech on how to improve our spoken English had great effect on me.变成感叹句为：what effect his speech on

how to improve our spoken English had on me.句意：你无法想像那时候他就如何提高我们的英语口语水平

的演讲对我的影响有多么深刻。