问题
选择题
---Who can tell me_______? ---Every 15 minutes.
A．when the bus will arrive.
B．how often the bus arrives
C．how long has the bus been away
D．when will the bus arrive
答案
答案：B
题目分析：句意：—谁能告诉我多久一次？—每十五分钟。根据答语，Every 15 minutes.可知回答的是频率，询问频率用how often，C和D的语序错误，A的语序正确，但不符合题意，故选B。