Question

—___ __must I take this medicine every day? 
—Three times a day.

A．How long

B．How often

C．How far

D．How

Answer 1

B

考查固定搭配。How long问多久How often问频率，多久一次；；How far问多远；How问怎样。根据Three times a day应是问频率，所以选B。