问题补充：
Having every night is very important for your health.
A. a good amount of sleeps
B. a number of sleep
C. a good amount of sleep
D. a great deal of sleeps
答案：
A. a good amount of sleeps
B. a number of sleep
(答案→)C. a good amount of sleep
D. a great deal of sleeps
解析：本题的含义是每天晚上有大量的睡眠对你的健康是非常重要的，sleep为不可数名词，故不选AD，a number of修饰可数名词，a good amount of表示大量的意思，修饰不可数名词，故本题选C。
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