【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(xué)生通常一晚上需要八小時(shí)的睡眠。復(fù)合形容詞有兩個(gè)特點(diǎn)：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(xiàng)的結(jié)構(gòu)，故選C。

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