题干
If we had not been ______ by the traffic jam, we would have arrived an hour earlier.
A：held dow
B：held away
C：held o
D：held u
答案(点此获取答案解析）
D
A：held dow
B：held away
C：held o
D：held u
与双曲线
有相同的焦点
，点
是两曲线的一个交点，且
轴，若
为双曲线的一条渐近线，则