Unit Six is ________ most difficult lesson, but it isn’t ________ most difficult one in this book.
| A．a; a | B．the; the |
| C．a; the | D．the; a |
Unit Six is ________ most difficult lesson, but it isn’t ________ most difficult one in this book.
| A．a; a | B．the; the |
| C．a; the | D．the; a |
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