問題詳情

3. Decades ago, in vitro fertilization was a _____ technology but now it’s an ordinary type oftreatment for infertility issues.
(A) cutting-board
(B) cutting-edge
(C) cutting-down
(D) cutting-up

參考答案

答案:B
難度:計算中-1
書單:沒有書單,新增