A. should have arrived B. should arrive

C. should have had arrived D. should be arriving

10. He paid for a seat, when he ______ have entered free. （05 山东卷）

A. could B. would C. must D. need

IV. 反思小结：______________________________________________________________

11. - Tom is never late for work. Why is he absent today?- Something ______ to him.

A．must happen B．should have happened

C．could have happened D．must have happened

12. I _______ have been more than six years old when the accident happened. （05 天津卷）

13. This cake is very sweet. You __________ a lot of sugar in it. （05 辽宁卷）

A．should put B．could have put C．might put D．must have put

ABDDBCDBAADBD