题干
---What did your teacher say this morning?
--She asked me this morning.
--She asked me this morning.
A：how did Tom come to school
B：why was Tom late for school
C：when Tom would get to school
D：what will Tom do at school
答案(点此获取答案解析）
C
中，若
、
分别为
、
的中点，平面
将三棱柱分成体积为
、
的两部分，那么
为（ ）