2. 外语
  3. Continuous short buzzes on the telephone indicate that the line is busy after you dial the telephone number.

Continuous short buzzes on the telephone indicate that the line is busy after you dial the telephone number.

admin2013-11-25  67
问题 Continuous short buzzes on the telephone indicate that the line is busy after you dial the telephone number.
选项 A、open
B、out of order
C、disengaged
D、in use
答案D
解析
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