___a few minutes earlier,the pollicemen would have caught the murderer.A.If they arrivedB Had they arrived为什么不选A?选B

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___a few minutes earlier,the pollicemen would have caught the murderer.A.If they arrivedB Had they arrived为什么不选A?选B

___a few minutes earlier,the pollicemen would have caught the murderer.A.If they arrivedB Had they arrived为什么不选A?选B
___a few minutes earlier,the pollicemen would have caught the murderer.
A.If they arrived
B Had they arrived
为什么不选A?选B

___a few minutes earlier,the pollicemen would have caught the murderer.A.If they arrivedB Had they arrived为什么不选A?选B
这是if 引导的虚拟从句 是对过去的虚拟 从句省略if 用了倒装 完整的语句是if they had arrived a few minutes earlier

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