Question

The train leaves＿＿＿6：00 pm, so I have to be at the station＿＿＿5：40 pm at the latest?

A. at； until
B. for； after
C. at； by
D. before； around

Answer 1

答案C
具体时间即点时间前常用介词at, 表示“到……为止”用by。