— will your father come back from New York?— In two days.A. How longB. How manyC. How oft

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。