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Question 86

The message was sent at 14:00, but Nia's laptop was offline from noon until evening. She ___ the message from that laptop.

  1. mustn't have sent
  2. can't have sentCorrect answer
  3. can't had sent
  4. couldn't have sending

Explanation

Can't have sent expresses a confident negative deduction about the completed sending, based on the offline device. Mustn't have sent would suggest prohibition or criticism, not logical impossibility.

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Question 86: The message was sent at 14:00, but Nia's laptop was offline… · English Modal Verbs · Questena