-——Why could not you get to Hong Kong tha-——Why could not you get to Hong Kong that night? ——Because——10.30 all the trains had left the station.A.in B.at C.by D.until

-——Why could not you get to Hong Kong tha-——Why could not you get to Hong Kong that night? ——Because——10.30 all the trains had left the station.A.in B.at C.by D.until
-——Why could not you get to Hong Kong tha
-——Why could not you get to Hong Kong that night?
——Because——10.30 all the trains had left the station.
A.in B.at C.by D.until

-——Why could not you get to Hong Kong tha-——Why could not you get to Hong Kong that night? ——Because——10.30 all the trains had left the station.A.in B.at C.by D.until
B
在某一个时间点用At