They considered a computer, which was considered a great help in their workA. to buy; to

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A. to buy; to be
B. buying; being
C. to buy; being
D. buying; to be
解析：考查consider的用法：consider大致有两种含义。consider作“考虑”解，后面接动名词， Consider作“认为”解时，常用于consider+sb./sth.+不定式。认为…是…，句意：他们在考虑买个电脑，我们认为这可以对他们的工作有很大帮助。选D。