第二语法和词汇知识(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。
We ____last night, but we went to the concert instead.
A. must have studied B. might study C. should have studied D. would study
I asked my English teacher and he replied with a ________look.
| A．determine | B．determines |
| C．determining | D．determined |
The plane takes off at 6:00 p.m. So I have to arrive at the airport ________ 5:30 p.m. at the latest.
A after B. since C. until D. by
--How long ________ as an assistant here?
-- Ever since I finished middle school.
| A．are you working | B．did you work |
| C．have you been working | D．do you work |
--Forgive me for hurting you by saying so.
--________
| A．You are welcome |
| B．It’s not your fault. |
| C．Oh, well, that’s life. |
| D．That’s not important |
They had ________ in keeping in touch with each other that they decided to move to the same city.
| A．such many difficulties |
| B．such much difficulty |
| C．so many difficulty |
| D．so much difficulty |