Question

Never a commanding lecturer, Koch had a thin, reedy voice and tended to interject his phrases with an annoying amount of “ums” and “ers.” But on March 24, 1882, when he presented his findings at a monthly meeting of the Physiological society of Berlin, he did so with clarity and elegant logic.

Which transition word in the passage indicates a comparison and contrast text structure?

(a) clarity
(b) when
(c) Never
(d) But

Answer 1

(d) But

"But" signals contrast between Koch's usual manner and how he presented on March 24, 1882.