Happen

[Freeguy]

"What's all the noise about? ""We had a bad accident ..... at the factory."
1- happened2- happening3- happen4- had happened

I have doubt about the accuracy of 2 and 3. Help me

 

[MikeNewYork]

"What's all the noise about? ""We had a bad accident ..... at the factory."
1- happened2- happening3- happen4- had happened

I have doubt about the accuracy of 2 and 3. Help me

To be honest, I wouldn't put anything in the blank. The sentence is clear without an addition.

 

[emsr2d2]

I wouldn't put anything there either but if I absolutely had to, it would be c).

 

[MikeNewYork]

I wouldn't put anything there either but if I absolutely had to, it would be c).

I would too, but it is in the form of a causative verb structure, which is a little troubling.

 

[Freeguy]

So what's the correct one here?

 

[bhaisahab]

So what's the correct one here?

As has been said, there isn't really a correct one. The least incorrect is "happen" but the sentence is fine and more natural without it.

 

[Raymott]

So what's the correct one here?

'happen' is the best choice.
PS: I prefer this font to your usual size 1 Times. Well done.