第一节：单项填空 (共15小题；每小题1分，满分15分)
请认真阅读下面各题，从题中所给的A、B、C、D四个选项中，选出最佳选项，并在答题卡上将该项涂黑。
21. Brussels, the capital city of Belgium, is _______ home to the European Union, _______ organization of European nations.
A. the; an B. 不填；an C. a; an D.不填; the
22. —Isn’t it amazing that I met Francis at the Christmas party?
—Really? For how many years ______ each other?
A. didn’t you see B. haven’t you seen C. hadn’t you seen D. don’t you see
