I don't know whether he _____(drops/will drop)by tomorrow.

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Idon''tknowwhetherhe_____(drops/willdrop)bytomorrow.Idon''tknowwhetherhe_____(drops/willdrop)bytomorro

I don't know whether he _____(drops/will drop)by tomorrow.
I don't know whether he _____(drops/will drop)by tomorrow.

I don't know whether he _____(drops/will drop)by tomorrow.
will drop

will droptomorrow明显是将来时态，所以就要用will表将来