—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
网友回答
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。