第一节：单项填空（共15小题；每小题1分，满分15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，并在答题卡上将该项涂黑。
21. —Jim didn’t turn up last time, didn’t he?
—No. He . We had changed our plan.
A. didn’t need to come B. needn’t have come
C. doesn’t need to come D. needn’t come
22. After three hours’ climbing, we stood at the top of the hill, we can see the whole town.
A. from which B. which C. that D. from where
