情态动词+have+done练习题(共2页).doc

巩固性练习：从A、B、C、D中选择最佳答案。1-You didnt wait for Mr. Smith last night, did you?-No, but we _. He didnt return home at all.A. couldnt have waited B. neednt haveC. didnt need to D. should wait2Harry _ have won the Physics competition easily yesterday, but he gave up. A. could B. might C. should D. must3-May I speak to your manager Mr. Smith at six oclock tonight ?”-“Im sorry, Mr. Smith to a conference before then.”A