高中英语非谓语动词命题陷阱详解及强化训练1
重难点讲解：
A cook will be immediately fired if he is found _______ in the kitchen. 
A. smoke        B. smoking     C. to smoke    D. smoked
______ the house on fire, he dialed 911.
A. To see       B. Seeing       C. Seen         D. Having seen

1. Everyone in our class was working hard and doing what we could _______ a good college.
A. enter                            B. to enter
C. entering                        D. entered