When people move to another country they often try the customs of their native land.A. t

问题补充：

When people move to another country, they often try the customs of their native land.

A. to keep on

B. to keep off

C. to keep up

D. keeping up

答案：

A. to keep on

B. to keep off

(答案→)C. to keep up

D. keeping up

解析：keep on意为“继续”。keep off意为“使离开”。keep up意为“保持，维持”。try to do sth意为“努力做某事”；try doing sth.意为“试着做某事（看行不行）”。