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

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

admin2010-03-19  61
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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