A decade ------ since the discovery of leprosy vaccine. The right option for the gap is:

A decade ------ since the discovery of leprosy vaccine. The right option for the gap is: Correct Answer has passed

   Seven days" Plural কিন্তু A week Singular. তেমনি 10 Years Plural কিন্তু  A decade Singular. Singular  এর নিয়ম: সময় প্রকাশের ক্ষেত্রে: Since এর পরের অংশে Past perfect না থাকলে Since এর পূর্বের verb টি সর্বদাই Present Perfect অথবা Present Perfect Continues Tense হবে। এখানে Since এর পরের অংশে Past Perfect নেই।
Bissoy MCQ

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A decade ... ... since the discovery of leprosy vaccine. Choose the right option to fill in the gap.
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