题干
.
My friend showed me round the town, ______ was very kind of him.
My friend showed me round the town, ______ was very kind of him.
A：where
B：that
C：which
D：it
答案(点此获取答案解析）
C
的一个焦点与抛物线
的焦点重合，且双曲线的离心率等于
，则该双曲线的方程为 （ ）