Soluzione del esercizio 4 di Performer B1, Vol. 2

Esercizi svolti per il libro Performer B1, Vol. 2

Soluzione

  1. have you had; Since
  2. has replaced
  3. has been working; since
  4. have known; for
  5. have you surfed
  6. have you been waiting; have been trying
  7. have been studying