—will your brother be back ? —In two weeks. A. How longB. How oftenC. How farD. How soon

问题补充：

—will your brother be back ?

—In two weeks.

A. How long

B. How often

C. How far

D. How soon

答案：

A. How long

B. How often

C. How far

(答案→)D. How soon

解析：句意：---你哥哥多久回来？---两周后。A. How long 多长（时间）；B. How often多久一次；C. How far多远；D. How soon 多久。how soon 的答语通常是in+段时间，故选D。