In fact, it’s these royal chefs who （）（使……日臻完善）the cooking art of Beijing roast duck.

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日臻完善 Beijing cooking

In fact, it’s these royal chefs who （）（使……日臻完善）the cooking art of Beijing roast duck.

A.have gradually completed

B.gradually perfected

C.have gradually perfected

D.have gradually created

正确答案：have gradually perfected

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