第二部分：英语知识运用（共两节，满分35分）
第一节 单项选择（共15小题；每小题1分，满分15分）
从每题所给的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.I can’ t remember when exactly the Robinsons left city. I only remember it was _________Monday.
A. the; the B. a; the C. a; a D. the; a
22.Is this the reason _______at the meeting for his carelessness in his work?
A. he explained B. what he explained
C. how he explained D. why he explained
