—Do you know he is going to stay in Shenzhen? —Sorry I don’t know. Maybe a few weeks bu

问题补充：

—Do you know he is going to stay in Shenzhen?

—Sorry, I don’t know. Maybe a few weeks, but I’m not sure.

A. when

B. how long

C. what time

D. how soon

答案：

A. when

(答案→)B. how long

C. what time

D. how soon

解析：考查疑问词的用法。根据a few weeks可推测所问的是时间段，用how long 提问。