问题
选择题
— ______sleep do you think is necessary for a Grade 9 student?
— 8 hours at least.
A．How often
B．How long
C．How many
D．How much
答案
答案：D
题目分析：句意：你认为对于一个九年级的学生多少睡眠是必要的。至少八个小时。A. How often 多久一次B. How long 多久 C. How many多少，加不可数名词D. How much 多少，加不可数名词。sleep,不可数名词，故选D。
