President Obama called Mandela“personal hero” while he was onvisit to South Africa in Jul

President Obama called Mandela “personal hero” while he was on visit to South Africa in July, 2013.
A. a; a
B. the; the
C. the; a
D. a; the

(答案→)A. a; aB. the; theC. the; aD. a; the解析：考查冠词用法。不定冠词a/an修饰可数名词单数，表泛指，意为“一个，某个”；定冠词the表特指，意为“这个，那个”。on a visit to sp访问某地，据此排除B、D；call sb sth把某人称作......，这里是泛指“一个个人偶像”，应该用不定冠词a，排除C，故选A。

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