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

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

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