“______ does Mr. Johnson go to London on business?”“At least onc

“______ does Mr. Johnson go to London on business?”“At least once a month.”
A、How many
B、How long
C、How often
D、How
【正确答案】：C
【题目解析】：C. How often - 询问频率或事情的规律性，比如：“你多久去一次电影院？”这个疑问词与回答“At least once a month.”（至少每月一次）完全匹配，表示频率。