1. You ________yesterday if you were really serious about the job.

   A. ought to come                   B. ought to be coming

   C. ought to have come                D. ought have come         

选C。 should+现在完成时可表示本该做而没做的事，表达劝告或责备的含义。本句中ought to =should，ought to have come表达责备的含义。

(译文：如果你真的对待工作严肃的话，你昨天就该来。)

2. My wallet is nowhere to be found. I ________when I was on the bus.

   A. must drop it                                B. should have dropped it

   C. must have dropped it                 D. had dropped it

选C。 must+现在完成时表示对过去事情较肯定的推测。

(译文：到处也找不到我的钱包，肯定是掉在车上了。)

3. John ________ be in the classroom because I saw him in the library just now.

   A. mustn’t                         B. isn’t able to

   C. can’t                                D. may not

选C。 mustn’t表示“禁止、不许”的意思，isn’t able to表示主观能力方面的“不能”，may not表示“可能不”，而这句话表达“不可能”的意思，can’t 可表此意义。

(译文：约翰不可能在教室，我刚刚看见他在图书馆。 )

4. ________my guest have forgotten my address?

  A.　Might         B.　May          C.　Could       D.　Would

选C。can／could+完成时表示推测时，只用于否定或疑问句中。may／might+完成时不用于疑问句中，主要用于肯定句中。

(译文：客人是不是把我的地址忘了？)

5. As it turned out to be a small house party， we ________so formally.

   A. needn’t dress up                  B. did not have dressed up

   C. did not need dress up                 D. needn’t have dressed up

选D。needn’t have+过去分词表示过去本来不是必须要做但已经做了的事。

(译文：那个聚会原来是个小型的家庭聚会，我们原本不必穿得那么正式。) 

6. If you don’t like to swim， you ________ stay at home.

A. should as well                                B. may as well

C. can as well                                 D. would as well

选B。may as well为固定短语，意思是“不妨”。

(译文：如果你不想去游泳，你不妨呆在家里。)

7. Go straight into the cave and find out what’s in there，________ ?

A. don’t you                                 B. do you

C. will you                                            D. can you

选C。祈使句构成反意疑问句时，通常在句尾加will you。

(译文：径直走进洞里去看看里面有什么，好吗？)

８. I want to go to the dentist， but you ________ with me.

A. need not to go                              B. do not need go

C. need not go                                  D. need go not               

选C。needn’t表示“不必”。

(译文：我想去看牙医，但你不必和我一起去。)

9. No one ________that to his face.

A.　dare to say                      B.　dare says

C.　dares saying                     D.　dare say

选D。 dare 做情态动词后面应跟动词原形。

(译文：没人敢当面和他说那事。)

10. A car stopped on the highway. It ________ out of gas.          

A. may not run                                 B. may have run

C. must run                                      D. ought to run

选B。may／might have+过去分词表示“或许已经发生了某事”。

(一辆车停在高速路上，可能是汽油用完了。)