When and where _the accident_?——In a factory yesterday.下面有选项A.was,happening B.was,happened C.did,happen D.has,happened说理由哦.

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When and where _the accident_?——In a factory yesterday.下面有选项A.was,happening B.was,happened C.did,happen D.has,happened说理由哦.

When and where _the accident_?——In a factory yesterday.下面有选项A.was,happening B.was,happened C.did,happen D.has,happened说理由哦.
When and where _the accident_?——In a factory yesterday.下面有选项
A.was,happening B.was,happened C.did,happen D.has,happened
说理由哦.

When and where _the accident_?——In a factory yesterday.下面有选项A.was,happening B.was,happened C.did,happen D.has,happened说理由哦.
选【C】
happen 没有被动语态,所以不能选B
答案里有yesterday明显的过去时态 标志,所以去掉D完成时态;
这里也没有正在进行的含义,所以选C

C
sth. happens 变成疑问句就是do sth happen