He is always serious ________ his work.


  1. A.
    about
  2. B.
    in
  3. C.
    on
  4. D.
    /
A
解析：本題考查be serious about sth的用法。B、C項介詞搭配錯誤，D項缺少介詞，故正確答案為A。
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科目：初中英語 來源：江蘇期末題 題型：完形填空

完形填空。
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