My pen pal Andrew found it difficult Chinese wellA. learningB. learnC. to learnD. learned

问题补充：

My pen pal Andrew found it difficult Chinese well

A. learning

B. learn

C. to learn

D. learned

答案：

A. learning

B. learn

(答案→)C. to learn

D. learned

解析：考查习惯用法“find sb. + adj. to do sth.”