Question

1. I wish he _______________________ (have) his hair cut! I can't stand his scruffy looks.

Answer 1

I wish he HAD his hair cut.

Форма HAVE прошедшего времени, так как это конструкция I wish, обозначающая желание. (I wish sm + V2)

Answer 2

1. I wish he had (have) his hair cut! I can't stand his scruffy looks.