问题补充:
— will you come back from Shanghai?—In one month.
A. How long
B. How often
C. How soon
D. How fast
答案:
A. How long
B. How often
(答案→)C. How soon
D. How fast
解析:句意:-你多久才从上海回来?-一个月以后。how long 多长时间,针对一段时间提问;how often 多久一次,提问频率;how soon 多久,多快,经常跟一般将来时连用;how fast 多快,提问速度。根据句意可知,这里问的是多久才能回来,故选C。