解决方法
进入安装WHMCS的目录下
将 https://www.google.com/recaptcha/
替换为 https://recaptcha.net/recaptcha/
即可, recaptcha.net 在大陆暂时没被屏蔽。
查找 grep -rni "www.google.com/recaptcha" 查找+替换 sed -i "s/google.com/recaptcha.net/g" `grep "www.google.com/recaptcha" -rl ./`