Question

I really couldn’t meet up with you yesterday, I _____ look after the neighbour’s children.

had to
must to
have to
ought to

Answer 1

Had to.. Maybe the right answer..

Answer 2

Heya
Here is your answer
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I really couldn't meet up with you yesterday, I had to look after neighbour's children.

We used had to instead to have to because there was couldn't
If there had been can't then we would have used have to

Must to can only come if there is a compultion but there is not....right!

ought to cannot come because on doing its hindi translation it is not making proper sense

So the answer is had to
____________________________________________________________

Hope it helps! ^_^