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Although working conditions ____ in many occupations in the past few years, one can never be safe, particularly in places with higher risk occupations.

A. might improve
B. can't have improved
C. may have improved
D. could improve
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CUB1 উপ-ইউনিটইংরেজি - গ্রামার ও ভোকাবুলারিTense & Sequence of TenseTense & Sequence of Tense (Topic Practice)CU - ⚡ অনলাইন প্রশ্নব্যাংক দেখুন 💥
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সঠিক উত্তরঃ C. may have improved
Explanation: