2010年高考英语试题分类汇编——虚拟语气
（10上海）
29. ---sorry, professor smith. i didn't finish the assignment yesterday.
---oh, you have done it as yesterday was the deadline.
a. must b. mustn't c. should d. shouldn't
答案：c
考点：本题考查的是虚拟语气
解析：此处表示和过去事实相反的情况，应该用should + have + 过去分词。本来应该做，而未做
