On your CentOS edit /etc/sysconfig/network-scripts/ifcfg-enp0s3 and set ONBOOT to yes and add the DNSs… in this case I’m using Google DNS ips.
ONBOOT=yes DNS1=8.8.8.8 DNS2=8.8.4.4
Should work! 
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VirtualBox – Share internet to (linux) VM – MACOSX!
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