例3: Thirteen hundred medical professionals,all of which have been trained to treat drug dependency,attended the annual convention sponsored by a society.(1999年)
此题答案是B。此题考点是引导定语从句时,whom和which 的区别,应将all of which改成all of whom。本题中定语从句所修饰的先行词是medical professionals(医学专家),因此,在这里不能用which引导定语从句。
例4:Vincent Van Gogh hilled himself when he was only 37,but he left behind him more than 2,000 paintings and drawings,that established his reputation in a way he would never have considered possible.(1998年)