Direction: In the following questions, some of the sentences have errors and some are correct. Find out which part of a sentence has an error. The number of that part is the answer. If there is No error your answer is (4) i.e. No error.
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Solve the question according to given instruction
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- Do you know that it was I
- who has done
- this piece of beautiful work?
- No error.
Correct Option: B
have will replace has because –
The antecedent of the Relative Pronoun agrees with the Verb.
Here, the antecedent of the Relative Pronoun (who) is I and hence have will be used.
Look at the examples given below : 
