【題目】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為泛指，故其前用an；句意：電腦是一個非常重要的發(fā)明，也是一種已經(jīng)改變了人們生活方式的發(fā)明。根據(jù)句意，故選B。

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