高中总复习英语非谓语动词专题练习Ⅰ.单项填空
1.The Olympic mascots are the Olympic flame, the fish, the panda, the Tibetan antelope and the swallow, _______ a close group of friends.
A. to represent B. representing
C. represented D. represent
2. The flu is believed _______ by viruses that like to reproduce in the cells inside the human? nose and throat.
A. causing B. being caused
C. to be caused D. be have caused
3.Walter offered us a lift when he was leaving the office, but our work _______,we refused the offer.
A. not finishing
B. had not been finished
C. not having finished
D. not having been finished