All the apples ____ fell down from the tree were eaten up by the

All the apples ____ fell down from the tree were eaten up by the pigs.
A、which
B、/
C、that
D、they
【正确答案】：C
【题目解析】：【考点点击】本题考查定语从句中关系代词的选择。【要点透析】当定语从句的先行项前有all修饰时,关系词应用that,其在定语从句中作felldown的主语。