单选题 10.He claims to be an expert in astronomy, but______he knows about it is out of date and inaccurate.
【正确答案】 C
【答案解析】what little(he knows about it)“(他知道的)那么一点点”。so much／so little…后面应跟结果从句或不定式as to；how much应引导疑问句。