问题
选择题
The days are approaching________the World Expo 2010 will be held in Shanghai.
A．that
B．where
C．when
D．which
答案
答案：C
考查定语从句的关系词。The days是先行词，在定语从句________the World Expo 2010 will be held in Shanghai中充当时间状语，所以选C。