Two-thirds of the mangoes ... rotten.

অপশনসমূহ
সঠিক উত্তর চিহ্নিত
was
were
has been
none of the above
💡
ব্যাখ্যা ও সমাধান
With fractions or percentages, the verb agrees with the noun in the prepositional phrase ('mangoes' is plural, so 'were').