A person a foreign language most be able to use the language all his own.A. learning forg

问题补充：

A person a foreign language most be able to use the language all his own.

A. learning ,forgetting

B. to learn, to forget

C. using ,but

D. who learns ,to forget

答案：

(答案→)A. learning ,forgetting

B. to learn, to forget

C. using ,but

D. who learns ,to forget

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