题干
1 often take a bus to school, but I go to school by bike.
A：some time
B：sometime
C：some times
D：sometimes
答案(点此获取答案解析）
D
1 often take a bus to school, but I go to school by bike.
A：some time
B：sometime
C：some times
D：sometimes
，则椭圆方程
