Student or Learner
I am not sure about the correct grammar of this phrase. For example:
It was not until 2010....
A.did the family reunite
B.that the family reunited
I instinctually answered A when I saw this question. "It was not until 2010 did the family reunite."
However, I was suspicious about my answer after seeing a number of people answering B, thinking twice again, B could be right too, that is why I posted this question here, as I am not sure about the grammar logic behind it.
Which is the grammatically correct answer? and why? Thanks.