件术86b5软021a22c9-d4e25d02限50ef科公方司元的东术广学8314方网b64e途慧技升优8de1量有
（2010年上海卷）
慧b62d7a95广件术86b5a09d根西学8314方上4e58有秀优8de1量4b60元的4fbe技心途-d4e25d02科公方829e东术软021a22c9量限50ef司升9654西网b64e29. ---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
慧b62d7a95广件术86b5a09d根西学8314方上4e58有秀优8de1量4b60元的4fbe技心途-d4e25d02科公方829e东术软021a22c9量限50ef司升9654西网b64e29. ---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