— have you been in this school?—For two years. A. How oftenB. WhenC. How soonD. How long

问题补充：

— have you been in this school?

—For two years.

A. How often

B. When

C. How soon

D. How long

答案：

A. How often

B. When

C. How soon

(答案→)D. How long

解析：根据答语内容For two years.，可知答案为D，表示多久一次，故选答案为D