Question

_______ we got to the station, the train had left already.

A．If

B．Unless

C．Since

D．When

Answer 1

D

试题分析：考查连词：A. If如果，B. Unless除非，C. Since自从，既然，D. When当…时候，句意：当我们到车站的时候，火车已经离开了。选D。