Human beings have used tools for a long time, ______ they would not have been ab

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问题 Human beings have used tools for a long time, ______ they would not have been able to develop their intelligence so fast.

选项 A、doubtlessly
B、therefore
C、otherwise
D、consequently

答案 C

解析从语法的角度来看，只有单词otherwise是连接词。从句子的意思上来看，也决定了选择使用单词otherwise。

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