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    【题目】He claims to be an expert in astronomy, but ________ he knows about it is out of date.

    A. what little B. so much C. how much D. so little

    【答案】A

    【解析】考查名词性从句。分析句子___he knows about it is out of date可知，___he knows about it是主语从句，而what在主语从句中作动词know的宾语，故用what。句意：他自称是天文学方面的专家，但他对天文学知道的那一点东西是过时的。因此选A。

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