The missing word is "than." The correct phrase is, "No sooner did he go in than he came out". "No sooner... than" is a common structure used to show that one event happened immediately after another.
No sooner did he go in ______ he came out.
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Question context
This question is part of 🌍 Current Affairs within the broader 🌐 Current Affairs & GK subject and appears in the Audit preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.