We are studying Unit 3 in this book. A. We have completed two units in this book so far. B. Three units in this book have been studied up to now. C. We have already studied three units in
We are studying Unit 3 in this book.
A. We have completed two units in this book so far.
B. Three units in this book have been studied up to now.
C. We have already studied three units in this book.
D. Unit 3 in this book has been completed.