—will you come back Mum? —In ten minutes.A. How longB. How soon C. How often D. How far

问题补充：

—will you come back, Mum?

—In ten minutes.

A. How long

B. How soon

C. How often

D. How far

答案：

A. How long

(答案→)B. How soon

C. How often

D. How far

解析：本题中的in+时间长度表示多久以后，对于多久以后提问的用how soon，故本题选B。