By the time he was 38, he had become principal of university.A. /; anB. /; aC. a; anD.

发布时间：2020-08-15 02:54:18

By the time he was 38, he had bee      principal of      university.
A. /; an
B. /; a
C. a; an
D. a; the

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A. /; an
(答案→)B. /; a
C. a; an
D. a; the
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