第一节 单项填空（共10小题；每小题2分，满分20分）
请从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。1-50在机读卡上作答。
1. They will fly to Washington, they plan to stay for two or three days.
A. where B. there C. which D. when
2. It was not until midnight they reached the camp site.
A. that B. when C. while D. as
