第23题: [单项选择]The doctor demanded that his patient ______ A. that he not work too hard for three months B. should not work too hard for three months C. taking it easy for three months D. to take some vacations for three months 参考答案:B 答案解析:虚拟语气。句子中间有demand,后面从句应该为虚拟语气的用法,用should+动词原形。
第27题:[多选题]GGSN中,离线计费可分为()。
In GGSN,the offline charging is classified into (). A.普通离线计费(按时间)
Normal offline charging(by time) B.普通离线计费(按流量)
Normal offline charging(by traffic) C.离线内容计费
Offline content based charging D.热计费
Hot Charging 参考答案:ABCD