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It takes years of practice to gain the skill of expert. [ ] A.不填,an B.a; the C.不

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It takes years of practice to gain the skill of expert. [ ] A.不填,an B.a; the C.不

It takes years of ________ practice to gain the skill of ________ expert.

[]

A.不填;an

B.a; the

C.不填;不填

D.不填;a

试题答案

答案:A