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    2．______ is known to us all that the old scientist，for ______ life was hard in the past，still works hard in his eighties．（　　）
    A．It； whomB．As；whoseC．As；whomD．It；whose

    分析 众所周知，这位年老的科学家，过去他的生活很艰难，在他八十多岁时仍然努力工作．

    解答 答案：A 考查it的用法．第一空：it is known to us all that…是个固定句型，意为"众所周知…"．第二空：介词+关系代词引导的定语从句，先行词the old scientist指人，作介词for的宾语，只能用whom，故选A．

    点评 考查it用法，弄清楚it的各种用法，准确地翻译句子，然后根据句意，选择最合适的答案．

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