题目内容：

The sun is bigger than the moon,__we all know it.
A.and
B.as
why choose A

优质解答

楼上的你错了!
两句简单句,所以要用连词连用,如果用as,
应该是：The sun is bigger than the moon,as we all know.
一般,放在句首更常见,
As we all know,the sun is bigger than the moon.