高中英语情态动词练习（附答案）

高中英语语法练习-情态动词 一、基础练习 1.He ___ have completed his work; otherwise, he wouldn't be enjoying himself by the seaside. A. should       B. must        C. wouldn't       D. can't 2. I _____ have been more than six years old when the accident happened.    A. shouldn't      B. couldn't     C. mustn't       D. needn't 3. This cake is very sweet. You ____ a lot of sugar in it. A. should put      B. could have put      C. might put    D. must have put 4. He paid for a seat, when he ____ have entered free. A. could        B. would         C. must         D. need 5. I was on the highway when his car went past followed by a police car. They ____ at least 150 kilometers an hour.    A. should have been doing              B. must have been doing C. could have done                    D. would have done 6. — 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