Kevin was not good at Chinese at first. After two months in China, , he made great progress.
A. while
B. but
C. however
D. otherwise
网友回答
A. while
B. but
(答案→)C. however
D. otherwise
解析：副词辨析。A当…时；然而；尽管；B但是（后面不需要使用逗号）；C然而（前后都需要逗号隔开）；D否则，要不然；句意：Kevin起初不擅长中文，然而，在中国两个月以后，他取得了很大的进步。故C正确。