There is a real possibility that these animals could be frightened, ______ a sud

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问题 There is a real possibility that these animals could be frightened, ______ a sudden loud noise.

选项 A、there having been
B、there was
C、being there
D、should there be

答案 D

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。
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