题目内容

— ______sleep do you think is necessary for a Grade 9 student?
— 8 hours at least.
A．How oftenB．How longC．How manyD．How much
D

试题分析：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。
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