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Review the referee's notes on a highly suspicious pet race. Select ALL the options that correctly complete the sentence to express that the turtle winning the 100-meter dash is a logical impossibility.
That tiny turtle ____________ the race in under ten seconds!
The correct answers are couldn't have won and can't have won.
When we are strongly certain that something did NOT happen in the past, we use can't have or couldn't have + past participle.
"Might not have won" only expresses a possibility. "Shouldn't have won" means it was a bad idea or unfair, but doesn't mean it was impossible!