People are living in world where mouse clicks rule our life, so online searches have beco

People are living in world where mouse clicks rule our life, so online searches have become must．
A. the; /
B. /; a
C. a; a
D. a; the

A. the; /B. /; a(答案→)C. a; aD. a; the解析：句意：人们生活在一个鼠标点击统治生活的世界，所以网上搜索成了必须之事。第一空：用a表示“一个……的世界”；第二空：a must一件必须之事。这两个空都是泛指，所以用不定冠词a，选C。

这下我知道了