It is...which...
It was this lack of repair work which was directly responsible for the explosion.
(It is...which...)

It was this lack of repair work that was directly responsible for the explosion.
(It is...that...used for emphasis)

Can you feel any differences in meaning?
The one with "which" is more common?

Question

It is...which...
It was this lack of repair work which was directly responsible for the explosion.
(It is...which...)

It was this lack of repair work that was directly responsible for the explosion.
(It is...that...used for emphasis)

Can you feel any differences in meaning?
The one with "which" is more common?

Answer

Thanks, Zackary.

Answer

I think it's more common to say the ''It is ... which ...'' structure, but both are correct. The difference is nearly unnoticeable to be honest, you could use them interchangeably :)