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    I developed very slowly and it took nearly two hundred years        I was built as an analytical machine by Charles Babbage.
    A．beforeB．afterC．longD．short
    A
    考查连词before的用法。在这里意为“才”，句意：我发展的很慢花了将近两百年的时间我才被建成一台分析机。所以选A。
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