A great deal of research (do) into the possible causes of cancer. (present perfect) change into passive
Share
A great deal of research (do) into the possible causes of cancer. (present perfect) change into passive
Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Answer:
cancer causes research a great deal