Watch out for these animals! They could be terrified a sudden loud noise．
A. being there
B. should there be
C. there was
D. there have been
网友回答
A. being there
(答案→)B. should there be
C. there was
D. there have been
解析：考查虚拟语气，should there be=if there should be,句子意思“小心这些动物，如果突然有大的声音，它们很可能令人害怕”，所以选B