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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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