问题补充：
－ does your brother watch TV every day?
－For half an hour.
A. How many
B. How often
CHow much
DHow long
答案：
A. How many
B. How often
C. How much
(答案→)D. How long
解析：句意:--你的弟弟每天看多长时间的电视？--半个小时。A. How many多少； B. How often多久一次； C. How much 多少； D. How long多长。根据句意故选D。
