The prisoner ______ this way, for here are his footprints.

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问题 The prisoner ______ this way, for here are his footprints.

选项 A、should have escaped
B、should escape
C、must have escaped
D、must escape

答案C

解析 本题考查情态动词表示推测的用法。英语中通常用must表示肯定推测。又因为犯人逃跑一定是在说这句话之前,因此需要用“must+have done”结构表示对过去事情的肯定推测,故C项为正确答案。
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