問題詳情
27. Scientific discoveries often happen unintentionally. In the early 20th century, Alexander Fleming noticed that the moldgrowing on one of the culture plates in his lab was killing all of the bacteria, ______ him to discover antibiotics.
(A) had lead
(B) was leading
(C) lead
(D) leading
(E) have lead
(A) had lead
(B) was leading
(C) lead
(D) leading
(E) have lead
參考答案
答案：D
難度：簡單0.727273
統計：A(0),B(2),C(0),D(8),E(0)
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