问题补充:
—Well, youve come back! did you stay in Shanghai?
— For about seven days. I really enjoyed myself.
A. How many
B. How far
C. How long
D. How often
答案:
A. How many
B. How far
(答案→)C. How long
D. How often
解析:根据答语内容For about seven days,可知问句的特殊疑问词为how long,表示多久,故选C