He claims to be an expert in astronomy, but in actual fact he is quite ignorant on the subject. ______he knows about it is out o

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问题 He claims to be an expert in astronomy, but in actual fact he is quite ignorant on the subject. ______he knows about it is out of date and inaccurate.

选项 A、What little
B、So much
C、How much
D、So little

答案A

解析 名词性从句。what引导名词性从句作句子的主语,连接代词what作know的宾语。
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