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单项选择题The ping loopback hangs with no output. Which of the following is the most likely cause？（）

A、The loopback interface is down and resolv.conf is configured.

B、The loopback is not in /etc/hosts and resolv.conf is configured.

C、The loopback interface is down and resolv.conf is not configured.

D、The loopback is not in /etc/hosts and resolv.conf is not configured.

  • D

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