投诉产生的原因一般包括()
A、承诺未兑现
B、金钱遭受损失
C、抱怨没人听
D、责任无人承担
参考答案:A, B, C, D
After the party, the boy apologized to the girl for the trick he had _____ on her. [ ]
A. taken
B. played
C. undertaken
D. conducted
命令“Netstat()”可以显示以太网的状态。
A、-f
B、-e
C、-c
D、-d