It is not easy to learn English well but if you ________, you will succeed in the end．

A.hang up

B.hang about

C.hang on

D.hang around

答案及解析： C

解析：

hang on表“(在逆境中)坚持，不放弃”之意。hang up挂断电话；hang about闲荡；hang around(在某处附近)等待，逗留。