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Gap (24.1):

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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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Gap (24.1):

A

had trained

B

had been training

C

has been training

D

was training

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