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【题目】The computer is an invention of ______ great importance,______ invention that has changed people's way of life.
A.the;the
B.不填;an
C.the;an
D.不填;the

【答案】B
【解析】of great importance“很重要”;第二空后的invention为泛指,故其前用an;句意:电脑是一个非常重要的发明,也是一种已经改变了人们生活方式的发明。根据句意,故选B。

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