After Marco Polo came to China he became friends with Chinese emperor of Yuan Dynasty n

问题补充：

After Marco Polo came to China, he became friends with Chinese emperor of Yuan Dynasty named Kublai Khan.

A. an; the

B. a; the

C. the; a

D. a; a

答案：

A. an; the

(答案→)B. a; the

C. the; a

D. a; a

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