I was surfing the Internet there was a knock on the door. A. while B. however C. when D——青夏教育精英家教网—

摘要： I was surfing the Internet there was a knock on the door. A. while B. however C. when D. and

网址：http://m.1010jiajiao.com/timu3_id_2915875[举报]

I was surfing the Internet there was a knock on the door.

A．while B．however C．when D．as

试题分类