Question

“________ do you exercise?” “Three  times a week. ”

A．How long

B．How often

C．How far

D．How many

Answer 1

B

试题分析：How long多长；How  often多久一次；How far多远；How many多少个。根据下文，一周三次。可知上文问的是，你多久锻炼一次？故选B。