【題目】 The students usually need ________ sleep a night.

A. eight hours B. eight-hours

C. eight-hour D. eight hour

【答案】C

【解析】試題分析：句意：學生通常一晚上需要八小時的睡眠。復合形容詞有兩個特點：一是數(shù)詞、名詞和形容詞之間要用連字符連接；二是名詞用單數(shù)形式，根據(jù)用法和所給選項的結構，故選C。

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