网络营销的主要内容不包括（）。
A．网上消费者行为分析
B．网上促销与网络广告
C．网络营销管理与控制
D．网页设计与制作
参考答案：D
Sorry, I'm busy _____ the moment. You can ask Jenny for help. [ ]
A. on
B. in
C. at
D. for
He's never late for class, ___________he? [ ]
A. isn't
B. is
C. has
D. wasn't
