hs3x3v8
幼苗
共回答了23个问题采纳率:82.6% 举报
B.
It is known that the compass was first invented in China.
这里是一个主语从句,it做形式上的主语,真正的主语是that the compass was first invented in China这个从句.由于这是一个主语从句,所以that不能省略.
A选项缺少that C选项 语态以及引导词不符 D选项如果改为AS KNOWN TO ALL THAT 才对
1年前
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