单选题
Customer Help Line Ring us any day, 8:30 am — 5:30 pm.First 10 minutes free, then calls charged at local rates.The cost of calls depends on
A、
A. what time of day it is.
B、
B. how long they last.
C、
C. where the caller lives.
【正确答案】
B
【答案解析】
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