Do you know the time____ the 2010 Shanghai World Expo opened?A、which B、why C、when D、in which

问题描述:

Do you know the time____ the 2010 Shanghai World Expo opened?A、which B、why C、when D、in which

C 定语从句 先行词time在从句中作时间状语,所以应该填入表示时间的关系副词when