There is something----in the street.A.happen B.happened C.ha

答案是C
你可以这样看：
1 There is something in the street。
2 Something is happening in the street。
现在,合并它们：
There is something / something is happening in the street。
现在,去掉一个something,用that替换：
-------There is something that is happening in the street。------这是定语从句。
现在,再去掉that is :
There is something happening in the street。------在这里,happening是分词结构做something的定语。