新概念2中定语从句which做主语问题
it is now known that many of these monster which have at times beenshi sighted are simply strange fish.
which指前面monster,说做主语不能省略,可句中monster主语,在加which做主语,2个主语?
the operation ,which lasted for over four hours ,proved to be very difficult because of the hard resin which covered the skin.
the hard resin which 中书上说which做主语,可the hard resin不就是主语吗?为什么还要which?