Questão de Língua Inglesa

What is the verb tense underlined in the following passage? ―Since the rise of the internet in the 1990s, English language (EL) teachers have had what might be described as a difficult relationship with technology. Initial teacher education has been slow to embrace digital ways of teaching and learning, meaning that many EL teachers feel that they have been poorly prepared to use technology in their teaching (Clark, 2018). Consequently, many EL teachers have been resistant to the digital wave which has revolutionised other areas of our lives.”