问题补充：
--- do you watch TV every day?
---Two hours .
A. How many
B. How much
C. How long
D. How often
答案：
A. How many
B. How much
(答案→)C. How long
D. How often
解析：How many多少个；How much多少，对钱，重量等不可数的量进行提问；How long多长；How often多久一次。根据答语Two hours两小时，可知对时间长短进行提问，故选C。
