题目内容：

what is__ (happen) yesterday evening?
用happen的正确形式填空,
稍微有点英语基础的人都知道happen的过去分词（happened）是不可以用在be动词后的！千万可别误导人啊，我谢谢你八辈祖宗~

优质解答

题目不好,要么是What happened yesterday evening,要么就是What was happening yesterday evening!