Question

---____ do you exercise, Miss Lin? ---Once a week. A．How long B．How often C．How far D．H

---____ do you exercise, Miss Lin? ---Once a week. A．How long B．How often C．How far D．How soon

Answer 1

B

疑问词辨析。How long多长；How often多久一次；How far多远；How soon多久。 根据答语内容为Once a week.可知上文提问频率，故选B。。