第二部分：英语知识运用（共两节, 满分40分）
第一节：单项填空（共10小题，每小题1分，满分10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．According to the newsman，as a result of heavy fog， expressway has been closed up until further notice．
A．a；the B．the；不填 C．不填；an D．the；the
-I'm going to attend your lecture at 9： 30 tomorrow morning.
-I regret to tell you that when you arrive, it will have ended and I __________ questions with my students.
| A．would discuss |
| B．will discuss |
| C．am discussing |
| D．will be discussing |
-I'll come to see your performance at 9：00 tomorrow evening.
-I'm sorry, but by then my performance __________ and I __________ re-porters in the meeting room.
| A．will have ended; will be meeting |
| B．will end; will meet |
| C．will be ended; am going to meet |
| D．is to end; will meet |
You'd better not ring me up between 9:00 and 10:00 tomorrow. I __________ an important meeting then.
| A．have |
| B．had |
| C．was having |
| D．will be having |
I __________ up to $5，000 by the time the new term begins in September.
| A．have saved |
| B．will have saved |
| C．will be saving |
| D．had saved |
-We'll go to the party to be held in the Grand Theater at 8： 00tonight. Could you join us?
-I'm afraid I can't. I __________ the paper with my instructor.
| A．am discussing |
| B．have discussed |
| C．will be discussing |
| D．will have discussed |