问题补充：
— have you stayed in New York?
—For about two weeks.
A. How soon
B. How often
C. How long
D. How much
答案：
A. How soon
B. How often
(答案→)C. How long
D. How much
解析：A. How soon多久 B. How often多久一次 C. How long多长时间D. How much多少，修饰不可数名词；句意：你在纽约已经呆了多久了？大约两周了。故选C
