This is the first time I (see) ______ such a terrible scene.

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问题 This is the first time I (see) ______ such a terrible scene.

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答案have seen

解析 动词时态。在句型“This(it) is+the+序数词+time+that从句”,that从句中的谓语常用现在完成时。如为This(it) was+the+序数词,那么从句就要用过去完成时。例如“This is the third time I have read this novel.(这是我第三次看这本小说了。)”。所以此处正确答案为have seen。
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