– milk do you need for the milk shake?– Well one cup is probably enough.A. How longB. Ho

问题补充：

– milk do you need for the milk shake?

– Well, one cup is probably enough.

A. How long

B. How many

C. How much

D. How often

答案：

A. How long

B. How many

C. How much

D. How often

解析：A. How long多长时间或长度B. How many多少，修饰可数名词的复数形式C. How much多少，修饰不可数名词 D. How often多久一次；句意：你需要多少奶昔？恩，一杯就够了。