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).
Scarcely had he gone when a policeman knocked at the door.
Scarcely had
he gone
when a policeman
knocked at the door.
No error
Correct answer is E
No explanation has been provided for this answer.