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请问一句英语虚拟的用法Theentirebuildingmayhavebeendestroyedbythefire____thefiredepartmentnotrespondedsoquickly.(A)if(B)had答案是B,为什么不选A,而选B呢?谢谢!
题目内容：
请问一句英语 虚拟的用法
The entire building may have been destroyed by the fire ____ the fire department not responded so quickly.
(A) if
(B) had
答案是B,为什么不选A,而选B呢?谢谢!优质解答
如果选IF
后面从句就不应该用NOT.而应该用didn't
选had是因为后面其实是倒装句.the fire department （had） not responded so quickly.
The entire building may have been destroyed by the fire ____ the fire department not responded so quickly.
(A) if
(B) had
答案是B,为什么不选A,而选B呢?谢谢!
优质解答
后面从句就不应该用NOT.而应该用didn't
选had是因为后面其实是倒装句.the fire department （had） not responded so quickly.
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