My grandfather swam with us in the sea. A. 83 year olds B. 83 year old C. 83-year-old D. 83-yea——青夏教育精英家教网—

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My ____ grandfather swam with us in the sea.

A. 83 year olds
B. 83 year old
C. 83-year-old
D. 83-years-old

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