When () the accident ()?A.was,happen B.did;happen C.is;happen D.was;happened 选B,为什么?

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When () the accident ()?A.was,happen B.did;happen C.is;happen D.was;happened 选B,为什么?
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When () the accident ()?A.was,happen B.did;happen C.is;happen D.was;happened 选B,为什么?
When () the accident ()?A.was,happen B.did;happen C.is;happen D.was;happened 选B,为什么?

When () the accident ()?A.was,happen B.did;happen C.is;happen D.was;happened 选B,为什么?
happen表示发生的意思,没有被动语态的哦,只能自己主动发生,不能【被发生】 所以要选择B