You can’t imagine what his speech on how to improve our spoken English had on me at that

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A. impression
B. advice
C. attention
(答案→)D. effect
解析：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。