Ôn thi Cấp tốc 789+ vào 10 môn Tiếng Anh (Đề 17)

Since then, it (18) ______ one of the most (19) ______ sources of entertainment

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Since then, it (18) ______ one of the most (19) ______ sources of entertainment for both the old and the young.
(18).

was

has been

will be

is