21. ----Did Susanna visit you again ______ next year?
----No, it was almost ten years before she came to see me ______ second time.
A. the; a B. the; / C. /; the D. /; a
22. It is still unclear ______ the little boy got the CD player to work.
A. where B. what C. that D. how
23. ----I can’t find my favorite magazine.
----I saw Jack going away with ______, but I’m not sure whether it’s yours.
A. it B. that C. one D. some
