Soluzione del esercizio 6 di Performer B2 - Student's Book

Esercizi svolti per il libro Performer B2 - Student's Book

Soluzione

  1. must be
  2. can't have failed
  3. may be / might be / could be
  4. may have used / might have used / could have used
  5. can't think / can't have thought
  6. must have left