【题目】31．Tired of her endless complaints, I walked out of the room she could open her mouth．
A．before B．until C．when D．once
在线课程【答案】A。
【解析】解析：句意：厌恶了她无尽的抱怨，她还未来得及张嘴我就走出了房间。Before在……之前，未来得及。如：He had measured me before I got in a word我还未来得及插上一句话，他就已经给我量好了尺寸。故选A。