Two-thirds of the mangoes... rotten.
A
was
B
were
C
has been
D
none of the above
Correct Answer: were
Use the same rule for fractions as for percent's -If it's a fraction of a plural, countable noun = pluralIf it's a fraction of a singular noun = singularIf it's a faction of a uncountable noun = singular Example: Two Thirds of the mangoes are rotten. Two Thirds of the mango is eaten. Two thirds of the money is spent. (un-count noun)