It s always a good idea to _______ your important digital files onto an external hard drive.
About this question
This question belongs to "Trắc nghiệm tổng hợp Phrasal Verbs - Đề số 2" on Học Mỗi Ngày. Review the answer, solution, and related items in the same set to study more effectively.
Question detail
It's always a good idea to _______ your important digital files onto an external hard drive.
A
back out
B
back up
C
back down
D
back away
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