A decade ------ since the discovery of leprosy vaccine. The right option for the gap is:
A. passed
B. has passed
C. have passed
D. had passed
RUUnit-ASet-1ইংরেজি - গ্রামার ও ভোকাবুলারিTense & Sequence of TenseRU - ⚡ অনলাইন প্রশ্নব্যাংক দেখুন 💥
সঠিক উত্তরঃ
B.
has passed
Explanation:

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