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

游客2024-07-03  9

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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