D. when constructed

　　44. ______ a clear idea of how this machine works, Mary is referring to lots of materials.

　　A. Gained

　　B. Gaining

　　C. To have gained

　　D. To gain

　　45. Referring to his notes during that important test led to _________.

　　A. having punished the boy

　　B. punishing the boy

　　C. the boy being punished

　　D. the boy to be punished

　　46. _______ honesty and justice caused him to lose popularity among his workers.

　　A. Wilson's lacked

　　B. Wilson's lacking

　　C. Wilson lacked

　　D. Wilson to lack

　　47. ______ on my computer, I found an e-mail from my pen friend, _____ me to spend the summer holiday in his city.

　　A. On turning; invited

　　B. On turning; inviting

　　C. When having turned; to invite

　　D. After having turned; inviting

　　48. Alice didn't notice I was coming, her mind _________ the work she was doing.

　　A. was totally fixed on

　　B. was totally fixing on

　　C. totally fixed on

　　D. totally fixing on

　　49. The old man sitting opposite me cleared his throat as if ________ something.

　　A. said

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