Since the middle of this century ______ has been learned about space than in all human history before that time.

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问题 Since the middle of this century ______ has been learned about space than in all human history before that time.

选项 A、much
B、more
C、better
D、a lot

答案B

解析分析句子后发现句中有than说明这是一个比较级的句子。题干中缺少主语，虽然better是比较级形式，但它是形容词，不能作主语。more是much的比较级，可以作主语。所以本题的正确答案为B。

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