问题
选择题
By the time he was 38, he had become ________ principal of ________ university.
A．/; an
B．/; a
C．a; an
D．a; the
答案
答案：B
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By the time he was 38, he had become ________ principal of ________ university.
A．/; an
B．/; a
C．a; an
D．a; the
答案：B