In the text, the word “24-by-7” means ( )

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问题 In the text, the word “24-by-7” means (    )

选项 A、24 hours-per-day, 7 days-per-week
B、24 days-per-month, 7 months-per-year
C、24 minute-per-hour, 7 hours-per-day
D、 7 hours per day.

答案A

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