【題目】It's important for students to get about _______ sleep every night.
A.eight hour
B.eight hour's
C.eight-hours
D.eight hours’

【答案】D
【解析】句意：對于學(xué)生來說每晚得到大約8小時的睡眠是很重要的。8小時的睡眠，用名詞所有格表達為eight hours’sleep。故選D。

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