第30题: [单项选择]There is a real possibility that these animals could be frightened, ______ a sudden loud noise. A. there having been B. there was C. being there D. should there be 参考答案:D 答案解析:本题中的should there be相当于if there should be,可以看出,这是省略了if后所采用的倒装结构,往往用于表示虚拟语气的条件句。