As we all know,the whole life of the doctor____studying the origin of cancerA has devoted to B was being devoted to C was devoted to Dhas been devoted to选哪个,为什么?每个选项解释下?

as we all know . as we all know是什么意思 as we all know的近义词? as we all know同义替换 As we all know,earthquakes are (destroy). As we all know,we get light and ___from the sun.(hot) As we all know,we are what we eat? as we know ;as is know;it is know 区别.______to all is that Taiwan Is the largest island in china.A.As is know.B.As we know C.It is know D.What is known选哪个. As we all know the Silk Road connected China to the west in ancien ttimes as we all know the Fragrant Hills is famous for the red maple l____准确 as we all know,the fragant hills is famous for the red maple l_ as we all know能放在句首么就是AS we all know ,XXXXXXXXXXXXXXXX As all we know 还是As we all know 正确啊,求高手解答.. As we all know ____ Great Wall is __longest wall in the world As we all know that the moon is (life) .词性转换 the most widely known as we all know well-known是什么意思~又有什么区别~ As we all know,Italy is ()European country.选项：A.an B.a C.the D./ as we all know中的as是什么词性?