用适当的关系代词或关系副词填空：
①I still remember the day ________ we studied together.
I still remember the day ________ we spent together.
②This is the factory ________ he used to work.
This is the factory ________ we visited yesterday.
This is the factory ________ makes this kind of car.
③This is the reason ________ he explained.
This is the reason ________ he failed in the exam.
④I don't know the way ________ he used last time.
I don't know the way ________ he solved the problem last time.
【答案】①when；that/which/不填 ②where；that/which/不填；that/which ③that/which/不填；why ④that/which/不填；that/in which/不填
介词＋关系代词
介词后只能用which指物，whom 指人，不可用that。介词的选用可根据从句中相关词组确定，也可结合句意根据先行词确定。该介词也可放在从句之尾。
用适当的“介词＋关系代词”填空：
①He is the person ________ we should learn.
②The bag ________ he put his books is lost.
③The man ________ she is talking is a doctor.
④The train ________ he was travelling was late.
【答案】①from whom ②in/into which ③to/about whom ④on which
