【題目】He claims to be an expert in astronomy, but ________ he knows about it is out of date.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】考查名詞性從句。分析句子___he knows about it is out of date可知，___he knows about it是主語從句，而what在主語從句中作動詞know的賓語，故用what。句意：他自稱是天文學(xué)方面的專家，但他對天文學(xué)知道的那一點東西是過時的。因此選A。

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