第二部分：英语知识运用（共两节，满分45分)
第一节 单项填空（共15小题：每小题1分，满分15分）
从所给A、B、C、D四个选项中，选出可以填入空白处的最佳选项，井在答题卡上将该项涂黑。
21.By around 900 AD, there were many places in Northern Europe ______the Vikings chose to live.
A. in which B. when C. which D. at which
22.Leif followed Biarn’s directions and sailed to _______is believed to be the coast of present-day Canada.
A.which B.what C.where D.that
