4．Tom told me that after a few years in China not only his Chinese, and that he had also obtained more interest.
A. does he improve
B. had he improved
C. he had improved
D. he will improve
网友回答
A. does he improve
(答案→)B. had he improved
C. he had improved
D. he will improve
解析：可联系答.案.网客服索取。