yogurt do you need?A. How longB. How manyC. How muchD. How old

问题补充：

yogurt do you need?

A. How long

B. How many

C. How much

D. How old

答案：

A. How long

B. How many

(答案→)C. How much

D. How old

解析：How long多长；How many多少个；How much多少，提问不可数名词；How old多大。句意：你需要多少乳酪？本句中yogurt是不可数名词，故选C。