___，the compass was first made in China.A.It is known to allB.It is known thatC.We all knowD.As is known to all題中AS放在IS的前面，我是第一次看到啦，AS不是n.，本句是陳敘句，我搞不懂了，請幫我分析一下，謝謝!
熱心網友
as is known 是一個固定的詞組搭配，是句我所知的意思，只要記住就OK 了英語就是這樣規定的。
熱心網友
這是一個定語從句，As在這一句中指的就是“the compass was first made in China”