大学英语语法专项练习题一、时 态1. By the end of April Peter here for three months. A. will have stayed B. will stay C. stays D. has stayed 2. Im awfully sorry, but I had no alternative. I simply _ what I did. A. ought to have done B. have to do C. had to do D. must do3. We _our breakfast when an old man came to the door. A. just have had B. have just had C. just had D. had just had4. Ever since the family mo
