问题
There is a chess match between a Korean player and AlphaGo(阿尔法).—It’s very amazing. Playing _____ chess is usually ________ one-to-one game.
A:an; /
B:the; a
C:an; a
D:the; /;
B:the; a
C:an; a
D:the; /;
正确答案是：
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