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— ______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

試題分析：句意：你認為對于一個九年級的學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，加不可數名詞D. How much 多少，加不可數名詞。sleep,不可數名詞，故選D。

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