tson2816 10/17/2023 8:54:24 PM

Question 43. Producing variable clones of many species is a lengthy and difficult problem and, despite questionable claims of success, has yet to be proven in humans.

     A. variable                          B. lengthy                           C. questionable                   D. proven

Trích: đề minh họa số 05 môn Tiếng Anh tôt nghiệp THPT 2023