【简答题】She said she was glad the difficulty had been _____. A. cleared away B. cleared up C. broken away D. broken down
【单选题】Only then _____ how much damage had been caused. [ ]
【单选题】为了保证棘轮在工作中的( )可靠和防止棘轮的( ),棘轮机构应当装有止回棘爪。
【单选题】She was () because she had been put into a dorm that had people from a variety of ethnic backgrounds.