allofwhich不能用作非限制性定语从句吗?Thirteenhundredmedicalprofessors,allofwhichhavebeentrainedtotreatdrugdependency,attendedtheannualconventionsponsoredbytheSocietrytoPreventDrugAbuse.当中把allofwhich改

Question

all of which 不能用作非限制性定语从句吗?
Thirteen hundred medical professors,all of which have been trained to treat drug dependency,attended the annual convention sponsored by the Societry to Prevent Drug Abuse.当中把all of which 改为all of whom的原因是什么?
There are over natural elements,some of which are very familiar.本句中some of which用法应该是正确的

Answer 1

你没有搞清楚定语从句中引导词的基本用法.which指代除了人以外的东西,而这里的professors是人,所以应该用代人的whom.知道了这个,第二句就好理解了.