Question

4.By tomorrow,he........his sums for ten days.
O has been doing
O had been doing
O
will have been doing
O was doing​

Answer 1

Answer:

had been doing his sums for ten days ..

Explanation:

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Answer 2

Answer:

will have been doing is the correct answer.

see some more examples

1. In November, I will have been working at my company for three years.
2. When I turn thirty, I will have been playing piano for twenty-one years.

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