Since then, it has (2) (be) one of the most popular sources of (3) (entertain) for both the old and the young.

Câu hỏi :

Since then, it has (2)                           (be) one of the most popular sources of (3)                           (entertain) for both the old and the young.

* Đáp án

* Hướng dẫn giải

been

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