第二部分：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。
21．When Mark opened the door, he saw a woman standing there．He her before．
A．never saw B．had never seen C．never sees D．has never seen
22．After a fire broke out in the lab, a lot of equipment ．
A．is damaged B．had damaged
C．damaged D．was damaged
23．It is almost five years we saw each other last time．
A．before B．since C．after D．when
24．He never said that he was good at mathematics, ?
A．was he B．wasn’t he C．did he D．didn’t he
