Lucy spent three years Chinese before she came to China.A. on learningB. to learnC. learn

问题补充：

Lucy spent three years Chinese before she came to China.

A. on learning

B. to learn

C. learning

D. Learn

答案：

A. on learning

B. to learn

(答案→)C. learning

D. Learn

解析：此题重点考查固定句型结构sb spend some time in doing sth表示某人花费多少时间做某事，其中in可以省略。