请看以下例句:Thousands of foreigners were attracted to the Shanghai World Expo the day it opened.上海世博会开幕那一天,成千上万的外国人就被吸引到那里。众所周知,状语从句是由从属连词引导的,可是在实际运用中,一些特殊的名词词组如上述高考试题中 See the following example: Thousands of foreigners were attracted to the Shanghai World Expo the day it opened. On the day the Shanghai World Expo opened, tens of thousands of foreigners were attracted to it. As we all know, adverbial clause is guided by subordinate conjunctions, but in practice, some special noun phrases such as the above entrance exam questions