问题
选择题
— Mr. Smith joined in different activities in Beijing. Do you know ___________?
— Since 5 years ago.
A．when he went there
B．how long he has stayed there
C．how soon he will come back
D．when he will come here
答案
答案：B
题目分析：句意：史密斯先生在北京参加了不同的活动。你知道他在那儿呆多久了吗？自从5年前。根据答语Since 5 years ago可知该选B。