6)Bob said he was going to join our club but he didn't. He ____ his mind.
　　A)can't have changed
　　B)wouldn't have changed
　　C)must have changed
　　D)shouldn't have changed

　　7)You____ to town to see the film yesterday. It will be on TV tonight.
　　A)needn't go
　　B)had better not go
　　C)should not go
　　D)needn't have gone

　　8)We____ the letter yesterday,but it didn't arrive.
　　A)must receive
　　B)ought to receive
　　C)must have received
　　D)ought to have received

　　9)With all the work on hand,he____ to the cinema last night.
　　A)mustn't go
　　B)shouldn't have gone
　　C)could not go
　　D)couldn't have gone

　　10)Eve was late for class again. She ____earlier.
　　A)should get up
　　B)must get up
　　C)need to get up
　　D)should have got up

　　答案：CDDDD