By the time he was 50, he had become president of company.A. /, anB. /, a C. a, an D. a, t

By the time he was 50, he had become president of company.
A. /, an
B. /, a
C. a, an
D. a, the

A. /, an(答案→)B. /, a C. a, an D. a, the解析：考查冠词。英语当中一些表示独一无二的职位的名词作表语或者补语的时候，单独使用，不需要加冠词。所以第一空不填。第二空后的company是一个单数可数名词在题中是泛指一家公司。

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