Have you forgotten _________ 1000 from me last month?
B. to borrow
The answer is A, but why not C? Can anybody kindly explain this to me?
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Have you forgotten that you borrowed $1000 from me last month?
Have you forgotten borrowing $1000 from me last month?
Have you forgotten to pay me back the money you borrowed from me last month?
Have you forgotten your wallet.
Have you forgotten who, what, when, where, why, how, whether, if...
Those are the ways the verb forget can be complemented.