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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?”
What will come in place of the question mark (?) in the following series?
32, ?, 30, 46, 28, 44
80, ?, 240, 80, 20, 4
22, 37, 63, 98, 148, ?
114, 156, ?, 238, 274, 304
80 81.5 83.5 ? 89 92.5
...350 435 367 ? 384 401
...196, 167, 144, ?, 108, 95
124, 107, 91, ? , 62, 49
150 - 10× ( 7 - 2)/4× 8 = ?
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