Gap (14.1):
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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.
Question detail
Gap (14.1):
A
had worked
B
had been working
C
was working
D
has been working
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