—Were you in the library when Jack arrived there?—Yes but I soon afterwards.A. had leftB

问题补充：

—Were you in the library when Jack arrived there?

—Yes, but I soon afterwards.

A. had left

B. left

C. would leave

D. will leave

答案：

A. had left

(答案→)B. left

C. would leave

D. will leave

解析：考查时态，句意是：--当杰克到图书馆的时候你在吗？--是的，但后来不久我就走了。说明我走了动作发生在杰克到之前，A不对，但是我走了动作发生在现在前，所以用过去时，选B。