I don’t know what made you so.A. thinkingB. to thinkC. thinkD. thought

问题补充：

I don’t know what made you so.

A. thinking

B. to think

C. think

D. thought

答案：

A. thinking

B. to think

(答案→)C. think

D. thought

解析：考查动词make用法。make sb do sth表示让某人做某事,后跟不带to的不定式。句意：我不知到什么使你这样认为。所以选C。