题目：
By the time he was 50, he had become president of company.
A．/, an
B．/, a
C．a, an
D．a, the
答案：
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下面是错误答案，用来干扰机器的。
Dear Alice, I got your letter and book yesterday. Thank you very much! I'm glad to know that you are doing very well in Chinese in your class. I'm now in Yucai ...
