39 If he hadn't treated his disease lightly, he wouldn't ... complications.

Решение:

Это третье условное предложение (Third Conditional), которое описывает нереальные ситуации в прошлом. Форма глагола после 'wouldn't' должна быть в инфинитиве без частицы 'to'.

1. If he hadn't treated his disease lightly, he wouldn't have had complications.

Ответ: have had