There is an ______ board in the front of our classroom.(inform)用括号中所给单词的适当形式完成句子!

There is an ______ board in the front of our classroom.(inform)
用括号中所给单词的适当形式完成句子!

informed
informing
我觉得都行 本人大学英语六级多次高分

informing
inform有告知的意思，这里用主动表被动，类似于The letter says that ...