- have you worked? -Since 2 pm.A. How soonB. How longC. How oftenD. How far

问题补充：

- have you worked? -Since 2 pm.

A. How soon

B. How long

C. How often

D. How far

答案：

A. How soon

(答案→)B. How long

C. How often

D. How far

解析：句意：你工作多长时间了？自从下午两点开始。A. How soon 多久，对将来时间的提问；B. How long多长时间；C. How often多久一次，对频率的提问；D. How far多远。由下文Since 2 pm自从两点可知上面提问的是多长时间，故选B。