Read each sentence to find out whether there is any grammatical error in it. The error, if any will be in one part of the sentence. The letter of that part is the answer. If there is no error, the answer is 'E'. (Ignore the errors of punctuation, if any).
Not one of the children has ever sang on any occasion in public before.
Not one of the children
has ever sang
on any occasion
in public before.
No error
Correct answer is B
has ever sung