新东方考研语法讲堂146

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21) As we did not know his address we could not get in touch with him.
    -----Not knowing his address we could not get in touch with him.
    22) As she had been there many times, she knew the place quit well.
    -----Having been there many times, she knew the place quite well.
    23) As we had not got a reply from them, we became quite worried.
    -----Not having got a reply from them, we became quite worried.
    24) Because they had been brought up in the city, they knew little about farmwork.
    -----Having been brought up in the city, they knew little about farmwork.
    25) He was a League member. He ought to take the lead in such activities.
    -----Being a League member, he ought to take the lead in such activities. such activities.