As the intelligence of robots increases to match of humans，we may use them to expand our

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A. it
(答案→)B. that
C. which
D. the
解析：考查代词：句意：随着机器人的智慧增加和人的智慧相匹配，我们可以用它们扩大我们的前沿。可知这里是指代intelligence，that可以指代前面的可数名词单数和不可数名词，it指代同类同物，which引导定语从句，the特指，后接名词，选B。