问题补充:
— will your father come back from New York?
— In two days.
A. How long
B. How many
C. How often
D. How soon
答案:
A. How long
B. How many
C. How often
(答案→)D. How soon
解析:How long多长;How many多少;How often多久一次;How soon多久。根据下文In two days.两天后,可知上文提问的是多久,故选D。