问题补充：
--students are there in your class,Mr Li? --Fifty.
A. How old
B. How much
C. How many
D. what
答案：
A. How old
B. How much
(答案→)C. How many
D. what
解析：根据Fifty可知，本题是在数量，所用应该选BC。根据students，可知应该用how many。因为how many跟复数，而how much跟不可数名词。所以本题选C。
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