Obama made history by being elected as first black president of the US.A. 不填；theB. a; th

问题补充：

Obama made history by being elected as first black president of the US.

A. 不填；the

B. a; the

C. a; a

D. the; a

答案：

(答案→)A. 不填；the

B. a; the

C. a; a

D. the; a

解析：考查冠词：第一空不填，make history创造历史，第二空填the，修饰序数词，句意：奥巴马当选美国第一个黑人总统从而创造了历史。选A。

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