"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
I wouldn't put anything there either but if I absolutely had to, it would be c).
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.
So what's the correct one here?