问题补充：
－milk do you need to buy?
－Two cartons.
A. How many
B. How long
C. How much
D. How often
答案：
A. How many
B. How long
(答案→)C. How much
D. How often
解析： 本题问的是不可数名词milk的量，对不可数名词量提问通常用how much，故选C。
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