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).
I have had to work at the fountain for almost ten hours before it could start functioning well.
I have had to work
at the fountain for almost
ten hours before it could
start functioning well.
No error
Correct answer is A
I had to work