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

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

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

答案B

解析 根据题干可知,a sudden loud noise是产生these animals…frightened这种结果的一个条件,从而排除[C]和[D]。[A]不符合语法规则,而[B]是一个省略if的倒装的虚拟条件句,可还原为if there should be…,符合题意,故为答案。
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