— ______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

試題分析：句意：你認(rèn)為對于一個九年級的學(xué)生多少睡眠是必要的。至少八個小時。A. How often 多久一次B. How long 多久  C. How many多少，加不可數(shù)名詞D. How much 多少，加不可數(shù)名詞。sleep,不可數(shù)名詞，故選D。
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