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

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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）”。