問題詳情

13. Teacher: When _________? Student: In 1928.
(A) was penicillin discovered
(B) did penicillin discover
(C) penicillin has discovered
(D) discovered penicillin

參考答案

答案：A
難度：適中0.517241
統計：A(15),B(6),C(4),D(3),E(0)