---Did you go to bed early last night?----No. I watched a movie so I didnt go to bed un

问题补充：

---Did you go to bed early last night?

----No. I watched a movie, so I didn go to bed until 11 o’clock.

A. 3-hours

B. 3-hours’

C. 3-hour’s

D. 3-hour

答案：

A. 3-hours

B. 3-hours’

C. 3-hour’s

(答案→)D. 3-hour

解析：句意：昨天晚上你睡得很早吗？不。我看了三个小时的电影。所以我直到11点才上床睡觉。3-hour为合成形容词，在句中做定语；故选D。