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            • 1． _____ to paint the house, John found it embarrassed to have to stop half way.

              [     ]


              A. Volunteering
              B. Having volunteered
              C. To volunteer
              D. Volunteered
              难度：中等
              解析 收藏 试题篮
            • 2． ______ volcanoes for many years, I am still amazed at their beauty as well as their potential
              to cause great damage.

              [     ]


              A. Studied
              B. Having studied
              C. Studying
              D. To have been studied
              难度：中等
              解析 收藏 试题篮
            • 3．
              __________ for several hours, they came to realize that they had a lot in common.

              A. Having chatted
              B. chatted
              C. To chat
              D. Chatting
              难度：中等
              解析 收藏 试题篮
            • 4．
              ____to reach them on the phone, we sent an e-mail instead.
              A. Fail
              B. Failed
              C. To fail
              D. Having failed
              难度：中等
              解析 收藏 试题篮
            • 5．          for months to look for a job as a bank clerk, Smith finally took a position at a local advertising
              agency.
              [      ]

              A. To struggle      
              B. Having struggled
              C. To be struggling  
              D. Struggled
              难度：中等
              解析 收藏 试题篮
            • 6．
              _____ at college for 3 years, she knows the place very well.

              A. To have studied
              B. Having studied
              C. Studying
              D. Studied
              难度：中等
              解析 收藏 试题篮
            • 7． _____ all day at home writing, the novelist went out for a walk in the evening.
              [     ]

              A. Spent
              B. Spending
              C. Having spent
              D. Having been spent
              难度：中等
              解析 收藏 试题篮
            • 8． ____ the chapter four times, I finally understood the author's theory.
              [     ]

              A. Reading
              B. Having read
              C. To read
              D. Read
              难度：中等
              解析 收藏 试题篮
            • 9．
              ____ the computer competition quite well, he won the first prize.
              A. Preparing
              B. Having prepared
              C. To prepare
              D. Prepared
              难度：中等
              解析 收藏 试题篮
            • 10．
              _____ in the queue for half an hour, the old man suddenly realized be had left the cheque in the car.

              A. Waiting
              B. To wait
              C. Having Waited
              D. To have waited
              难度：中等
              解析 收藏 试题篮
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