10. ---- Are you still going to Shanghai for the Spring Festival?

　 ---- Yes, but I really _____ because I have a lot of things to deal with.

A. can’t　 B. mustn’t　 C. won’t　 D. shouldn’t

答案：D

解析：should在此表示“照道理”，本句意思是“但我真的不该去，因为我有许多事要处理”。

9. ---- Well, I forgot to bring my dictionary here yesterday.

　 ---- Actually you _____ it here. You were not allowed to use it.

　 A. needn’t bring　　　 B. needn’t have brought

　 C. didn’t need to bring　 D. don’t have to bring

法案：C

解析：答案正确理解场景中的句子含义很重要。上文很遗憾地说没带字典，下文说不必带，因为不被允许用字典，时态是过去，因此A、D排除，B尽管是need+完成时表示过去，但含义不对，needn’t have brought意思是“本不必带来”，隐含的意思是实际上带来的，与题目中交代的情况不符，只有C从时态和含义上都正确。

8. The poor boy _____ the test again; in that case, his mother will be very disappointed.

　 A. must have failed　　 B. might fail

　 C. could have failed　 D. should fail

答案：B

解析：从后文的将来时可以断定考试的结果还不确定，只是在进行推测，故排除A、C，D的语气不对，只有might表示语气不确定的“可能”，符合题意。

7. ---- We weren’t sure which way to go. In the end we turned right.

　 ---- You _____ the wrong way. You _____ left.

　 A. went; should have turned

　 B. have gone; must turn

　 C. went; would have turned

　 D. had gone; must have turned

答案：A

解析：首先来确定时态是在描述过去，故先排除B，再根据含义来选正确的情态动词，既然说对方走错了路，那么下面肯定是告诉对方“本该”，用should have done结构。

6. ---- Why is Jenny still standing there? It’s so cold.

　 ---- She _____ for someone.

　 A. can wait　　　　　 B. might have waited

　 C. must be waiting　　 D. should have waited

答案：C

解析：考查情态动词中时态的使用。根据上文可知是在描述现在的动作，因此用情态动词+进行时，同时考查情态动词的含义，表示有把握的推测用must。

5. It is necessary that people both young and old in China ____some English to be prepared for the Olympic Games to be held in Beijing in 2008. A. learn B. will learn C. must learn D. have learned

答案A。

解析：在句型 It is necessary(strange, natural, important...)+从句结构中，从句中谓语动词要用"should+动词原形"构成，should 可以省略。

4. It’s high time that we students _____ even harder at our lessons as the national entrance examination is coming nearer.

A. work B. will work C. worked D. have to work

答案 C。

解析：在It is time that ...句型结构中，从句的谓语动词要用虚拟结构，可以用一般过去时，也可以用should +动词原形，但should不可省略。

3. ____him not to do so, he wouldn’t have made such a serious mistake.

A. Did I persuade B. If I persuade C. If I should persuade D. Had I persuade

答案D。

解析：题干中主句的谓语动词使用了wouldn’t have made， 说明该动作表示与过去事实相反，故条件句使用表示与过去事实相反的虚拟结构if sb. had+过去分词，或使用 had sb. done 即省略了if的虚拟结构。

2. His suggestion that you ____once more sounds reasonable. A. try B. tried C. must try D. can try

答案A。

解析：分析句子意思可以知道，名词suggestion之后的从句为同位语从句，从句中应使用 "should+动词原形"。其中 should 可以省略。

1. -I ____ to your birthday party last Sunday. -Unfortunately, you were out on business.

A. had come B. came C. would come D. would have come

答案：D

解析：根据对话情景可知，答句Unfortunately, you were out on business.(不幸的是你出差了)实际上是上一句暗示的条件。从答句所给的特定的动词时态(一般过去时)来看，上句所说内容是对过去情况的假设，故暗示的条件句应为If I hadn’t been out on business，由此可见，选项部分为主句的谓语动词，表示与过去事实相反，应选用would have come。答案 D。