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1 vote
Which word correctly completes the sentence?

We will celebrate both __________ birthdays with a single big party.

A.
sister's

B.
sisters

C.
sisters'

User Xel Naga
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1 Answer

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C sisters' because there is more then one sister. If it was talking about a sister then it would be A, but sense it said both then it would be sisters'.

User McLaren
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