题目

题型：不详难度：来源：

---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

解析

试题分析：句意：--对不起，史密斯教授，我昨天没有完成作业。--哦，你应该早完成它，因为昨天是最后期限。should have done指过去应该做的还未做，故选C。
点评：本题难度适中。
即学即练：I didn"t know his telephone number， otherwise I ______ him.
A. had telephoned           B. would telephone    
C. would have telephoned     D. telephone
解析：C。句意：我不知道他的电话号码，要不然的话，我就给他打电话了。