问题补充：
— do you go to the cinema?
—Once a month.
A. How long
B. How many
C. How much
D. How often
答案：
A. How long
B. How many
C. How much
(答案→)D. How often
解析：A. How long多长； B. How many 多少，提问可数名词数量；C. How much多少，提问不可数名词数量；D. How often多久一次，提问频率，根据答语 Once a month.（一月一次）可知问句是问多久一次，故选D。
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