－Julia will your son return?－In a week. A. how often B. how far C. how soon D. how long

问题补充：

－Julia, will your son return?

－In a week.

A. how often

B. how far

C. how soon

D. how long

答案：

A. how often

B. how far

(答案→)C. how soon

D. how long

解析：how often多久一次；how far多远；how soon多久；how long多长。根据下文，一周后。可知选C。