单项填空
21.----Have you finished your English composition yet?
------No, I____ my math homework all day yesterday.
A.was doing B. would do C. had done D. did
22. As a child, Peter studied in a suburb school, ____is named after his grandfather.
A. which B. where C. what D. that
23. Mr. Li showed his students some old maps ____from the library.
