ADSL拨号用户通过（）命令判断域名解析故障。
A、ping
B、ipconfig
C、nslookup
D、tracert
参考答案：C
What _____ good time we had________ a picnic yesterday!
A．a;had
B．\; having
C．a; having
D．\; had
绿海龟在什么时间产蛋？
