题干
Doing your homework is a sure way to improve your test scores, and this is especially true ____ it comes to classroom tests.
A：before
B：since
C：whe
D：after
答案(点此获取答案解析）
C
（千米）的地图上量得甲、乙两地的距离是5厘米，甲、乙两地之间的实际距离是