首先要读从句，看内容是否完整，A.当缺主语或宾语时，用WHICH；That was a fault which (could not be forgiven ).I'll never forget the day _which__we spent in Beijing. We spent the day in Beijing.作宾语用whichB.当句子有主语谓语宾语，就可能是补状语了，用WHEN/where1.I'll never forget the day _when_ (I first went to school).I first went to school on that day. 做状语用wh...
