【选择】B.that
【解析】
这是 great inventions have changed our life（伟大的发明改变了我们的生活）的强调句,意思是“正是伟大的发明才改变了我们的生活”.
强调句的句式是：it is + 强调成分 + that + 其余部分.
本句强调的是主语 great inventions
It is the great invention _have changed our life.
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