--have you worked in the factory?--For 5 years.A. How soonB. How muchC. How oftenD. How lo

问题补充：

--have you worked in the factory?

--For 5 years.

A. How soon

B. How much

C. How often

D. How long

答案：

A. How soon

B. How much

C. How often

(答案→)D. How long

解析：How soon多久；How much多少钱，多少，提问不可数名词；How often多久一次；How long多长。根据答语，五年。可知选D。