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"has done" should be changed to "have done." After "who," the verb should agree with the subject "I," so "have" is the correct form. The improved sentence is “Do you know that it is I who have done this piece of beautiful work?”
Five friends, P, Q, R, S and T are sitting in a row facing south. Q is sitting in the centre position. P is sitting at the west end. T and R are sitting...
Who among the following person sits 2nd to the right of the one who sits opposite to S?
Who among the following sits opposite to E?
Eight persons, R, S, T, U, V, W, X and Y, sit around a square table and faces towards the centre of the table. Four of them sit at the corner of the tab...
What is the sum of present age of PAWAN and the one who is third to the right of PAWAN?
Who among the following lives on floor no.3?
What is the position of R with respect to her grandmother?
Who sits second to the right of W?
Who among the following are an immediate neighbours of E?
Four of the following five are like in a certain way and form a group. Which of the following does not belong to that group?