Question

The train leaves at 6∶00 p. m．So I have to be at the station ________ 5∶40 p. m. at the latest．

1. A.
   until
2. B.
   on
3. C.
   by
4. D.
   at

Answer 1

C
句意为：“火车在下午6点开车，所以我最迟要在5点40分之前赶到车站。”根据句意和各介词的用法，应选by。