2. 外语
  3. He was so engaged ______ his business that he hadn’t been home for a month.

He was so engaged ______ his business that he hadn’t been home for a month.

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问题 He was so engaged ______ his business that he hadn’t been home for a month.
选项 A、at
B、on
C、for
D、in
答案D
解析
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