Which preposition is used with a period of time (e.g., three hours) in this tense?
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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
Which preposition is used with a period of time (e.g., three hours) in this tense?
A
since
B
for
C
at
D
by
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