Question

The scientist’s many years’ careful observation ____ a surprising discovery.

A．ran into

B．began with

C．led to

D．came from

Answer 1

C

考查短语辨析。ran into 偶然遇见，began with 以什么开始，led to 导致，came from 来自，句意：科学家们许多年的细心观察导致了一个令人吃惊的发现。所以选C。