— Why didn’t you try your best to get on the subway? — I tried to but it started moving

问题补充：

— Why didn’t you try your best to get on the subway?

— I tried to, but it started moving I could get on it.

A. before

B. after

C. since

D. if

答案：

(答案→)A. before

B. after

C. since

D. if

解析：句意：——为什么你不尽最大努力坐地铁呢？——我已经尽力了，但是我还没来得及登上地铁，它就开始移动了。A. before在……之前，还没来得及； B. after 在……之后； C. since自从；D. If如果。结合句意，故选A。