第一节单项填空（共25小题，每小题1分，满分25分）
从A,B,C,D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该选项涂黑。
21. China ______ the developing countries in the world.
A. is belonged B. is belonging to C. is belonged to D. belongs to
22. There is no doubt ______ the boxes were then put on a train for Konigsberg.
A. which B. what C. that D. whether
23. I have three best friends, _______ are abroad now.
A. all of them B. all of which C. all of whose D. all of whom
24. Is it worth ____ _ lost cultural relics such as the Amber Room or Yuan Ming Yuan in Beijing?
A. rebuilding B. to rebuild C. rebuild D. rebuilt
25. As time ___ __by, I became more and more interested in English.
