They had a _______ rest yesterday.
A.3--hours        B. 3--hour         C. 3 hours
B
句意：昨天他們有一個三個小時的休息時間。三個小時的休息：a  3--hour rest ,這是一個復(fù)合形容詞，中間應(yīng)用單數(shù)形式。所以選B。
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