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We___(not / wait) for very long when the bus finally arrived.

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This question belongs to "Thì quá khứ hoàn thành tiếp diễn – Past Perfect Continuous" on Học Mỗi Ngày. Review the answer, solution, and related items in the same set to study more effectively.

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We___(not / wait) for very long when the bus finally arrived.

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