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When I___ten years old, I began to play football.

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This question belongs to "Làm chủ các thì của động từ (Verb Forms)" on Học Mỗi Ngày. Review the answer, solution, and related items in the same set to study more effectively.

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When I___ten years old, I began to play football.

A

am

B

was

C

were

D

has been

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