The scientist’s many years’ careful observation ____ a surprising discovery.
A．ran intoB．began withC．led toD．came from
C
考查短語辨析。ran into 偶然遇見，began with 以什么開始，led to 導(dǎo)致，came from 來自，句意：科學(xué)家們許多年的細(xì)心觀察導(dǎo)致了一個令人吃驚的發(fā)現(xiàn)。所以選C。
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