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【题目】Children should have at least _________ at night.

A. eight-hours sleep B. eight hour's sleep

C. eight-hours-sleep D. eight hours' sleep

【答案】D

【解析】句意:孩子们晚上至少应该有八个小时的睡眠时间在英语中,“”数词+连字符+名词的单数以及“数词+复数名词的所有格”都可以用作定语,修饰名词,只有D答案符合题意,故答案为D。

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