问题
选择题
Thousands of years ago people discovered the phenomenon by chance, and this was _____ the idea of the compass first came from.
A．how
B．what
C．where
D．that
答案
答案：C
考查定语从句。句中the phenomenon为下文the idea of the compass first came from的逻辑地点状语，故选C，where做from逻辑宾语，指代前文的the phenomenon。