A、0743,12536 extension 15. B、0734,21653 extension 51. C、0734,38750 extension 15. D、0743,62135 extension 51. B

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问题  

选项 A、0743,12536 extension 15.
B、0734,21653 extension 51.
C、0734,38750 extension 15.
D、0743,62135 extension 51.

答案B

解析
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