2. 专升本
  3. After the war Fleming specialized______bacteriology, and in 1924 he became professor of bacteriology at St. Mary’s Hospital.

After the war Fleming specialized______bacteriology, and in 1924 he became professor of bacteriology at St. Mary’s Hospital.

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问题 After the war Fleming specialized______bacteriology, and in 1924 he became professor of bacteriology at St. Mary’s Hospital.
选项 A、with
B、in
C、on
D、by
答案B
解析
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