Question

They had finished preparations by the time the guests arrived.

Answer 1

heya mate...

you haven't mentioned what we have to do in this sentence....

but if you want it to be changed in active voice then the answer is....

the preparations had been finished by the time the guest arrived...

hope it helps you....

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Answer 2

$hey \: dear.....$
PLZ TELL WHT WE HV TO DO IN THIS SENTENCE.....
FOLLOW ME DEAR PLZ....