There is a possibility that these hens could be frightened and lay fewer eggs a sudden lou

There is a possibility that these hens could be frightened and lay fewer eggs a sudden loud noise.
A. should there be
B. there was
C. would there be
D. there having been

(答案→)A. should there beB. there wasC. would there beD. there having been解析：考查虚拟语气中的倒装。根据语意，原句应为…if there should be a sudden loud noise，if虚拟条件句中有should时，可以把if省略，should提前，变成should there be 结构，据此选A.

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