If the policemen (arrive) ______ earlier, they would have seen the accident.

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问题 If the policemen (arrive) ______ earlier, they would have seen the accident.

选项

答案had arrived

解析此句是虚拟语气，与过去事实相反，故if从句用过去完成时，主句用would have done sth.。句意：如果警察早点到，他们就能看到这场事故了。

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