The words that we should pay attention to on the blackboard.
A. being written
B. are written
C. is writing
D. writing
网友回答
A. being written
(答案→)B. are written
C. is writing
D. writing
解析：考察语态。句意：我们应该注意的那些句子写在黑板上了。结合语境可知本句主语为动作对象，故用被动语态。本句子的主语为the words 为复数形式，故选B。