2.We ____(begin) to learn English since 3 years.

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2.We ____(begin) to learn English since 3 years.

2.We ____(begin) to learn English since 3 years.
2.We ____(begin) to learn English since 3 years.

2.We ____(begin) to learn English since 3 years.
began.
最后少了一个before

We have began(begin) to learn English since 3 years.