It’s the second time that I _______ in Beijing. What great changes! It’s years since I ________ here last time.

A．went; had left

B．had been; left

C．have been; left

D．have; had left

( )是指企业以互联网为媒介向虚拟市场传递有关商品和服务相关信息，引发消费者购买欲望，刺激消费者购买行为的活动。

A．网络直销

B．网站促销

C．网站传销

D．网络传销