将这两句合并为一个定语从句I study in an old school.At the back of the school is a busy street.

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将这两句合并为一个定语从句
I study in an old school.At the back of the school is a busy street.

I study in an old school,at the back of the which is a busy street.

I study in an old school at the back of which is a busy street.