定语从句:His father died last year, ______ made it impossible fo
定语从句:His father died last year, ______ made it impossible for him to go abroad.
His father died last year,___made it impossible for him to go abroad.
A.When B,which C.as D,that
请讲解一下为什么选B 不选C which 和 as 在引导定语从句中有什么区别