it's impossible to know everything ( )going on in the world
there is ,as is ,it is or what is
人气：381 ℃ 时间：2020-03-21 06:29:37
解答
what is
不可能知道世界上每一件事是怎麼继续下去的
it 是形式主语替代know everything.
what is going on in the world 对everything 做补充说明
what引导的主语补语
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