从每小题的A、B、C、D四个选项中，选出能填入空白处的最佳选项。并在答题卡上将该选项涂黑。
11. Xi’an is ______ beautiful city and people throughout the world like to have a visit to her.
A. most B. a most C. the most D. most a
12. According to recent reports, one of the rare animals, ______ crocodile, is in ______ danger of dying out.
A. a; the B. /; a C. /; the D. the; /
13. Whom would you rather ______ the washing, Nancy or Rose?
A. have do B. do C. have had D. have done
