In the comic strip, Calvin says: “Sometimes I think the sure...

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Q4405115 Inglês
Read the Text II to answer the question.

Text II

In the comic strip, Calvin says: “Sometimes I think the surest sign that intelligent life exists elsewhere in the universe is that none of it has tried to contact us.” Focus specifically on the underlined phrase “has tried”. From a morphosyntactic and semantic perspective, why is the Present Perfect tense used here instead of the Simple Past? 
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