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3.You ______ very fast if you went from New York to Boston in six hours.(  )
A.should driveB.would have driven
C.may driveD.must have driven

分析 如果你在六个小时内从纽约去波士顿,你开车一定很快.

解答 答案:D
句意表达的是对过去事实的肯定推测,要用情态动词加完成时态来构成;would加完成时态表示的是虚拟,不是推测.故选D.

点评 在表示建议,命令,要求的名词性从句中,从句要用should加动词原形来构成虚拟,should可以省略.学习时要注意区分条件虚拟句.

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