— will you stay in Shenzhen for your summer vacation?
—For about two weeks.
A. How far
B. How often
C. How soon
D. How long
网友回答
A. How far
B. How often
C. How soon
(答案→)D. How long
解析：考察特殊疑问词。A对距离提问；B对频率提问；C对将来时提问；D对一段时间提问；根据回答for about two weeks可知是对一段时间的提问，故D正确。