Question

           do you go to the library.I usually go to the library twice a week.

A．How long

B．How often

C．How far

D．How many

Answer 1

B

试题分析：句意：你多长时间去一次图书馆？通常一周两次。how long 多长时间，提问时间段；how often 多长时间一次，提问频率；how far多远 ，提问距离；how many多少，提问可数名词的数量，故选B。