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He...............as a teacher before he became a lecturer.

A. have worked
B. had worked
C. was worked
D. works
E. have been worked
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IUBSUMMERইংরেজি - গ্রামার ও ভোকাবুলারিTense and Sequence of TenseTense and Sequence of Tense (Topic Practice)IUB - ⚡ অনলাইন প্রশ্নব্যাংক দেখুন 💥
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সঠিক উত্তরঃ B. had worked
Explanation: