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

C

具体时间即点时间前常用介词at, 表示“到……为止”用by。