Do you know that it was I (1) / who has done (2) / this piece of beautiful work? (3)/ No error.(4)

Options

A. 1 Do you know that it was I
B. 2 who has done
C. 3 this piece of beautiful work?
D. 4 No error.

Answer

2

Explanation

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:

Hence, who have done is the right usage