Question

【题目】We can see more police than usual at the crossings ________ snowy days.
A.in
B.at
C.on
D.With

Answer 1

【答案】C
【解析】句意：在下雪天，我们在十字路口能看到更多的警察。具体到某一天，前面用介词on。所以答案是C。