题干
The car accident happened ____ a cold winter morning. Luckily, no one was hurt.
A：in
B：on
C：at
D：of
答案(点此获取答案解析）
B
The car accident happened ____ a cold winter morning. Luckily, no one was hurt.
A：in
B：on
C：at
D：of
，
，
，
， ，
中无理数有几个