I thought it was not necessary to book tickets for the film in advance, but I was wrong. A. I needn’t have booked tickets for the film in advance. B. I couldn’t have booked tickets for the

I needn’t have booked tickets for the film in advance.

I couldn’t have booked tickets for the film in advance.

I should have booked tickets for the film in advance.

I must have booked tickets for the film in advance