分类：教育/科学-学习帮助
问题：选择题Withthethoroughinvestigationm 
Wh the thorough investigation made so far,the causes of the fire are not far(       )A)to seekB)from being sought
回答：B
far from 远远不；完全不；决不
后面加上doing/sth
火灾的原因一点也不清楚