—Are you still working in that company Mary?—No it is ten months I worked there.A. aft

问题补充：

—Are you still working in that company, Mary?

—No, it is ten months I worked there.

A. after

B. that

C. before

D. since

答案：

A. after

B. that

C. before

(答案→)D. since

解析：考查固定句型。It is/has+一段时间+since从句，意为“自从（不）做某事已经多久了”。句意：--玛丽，你还在那家公司工作吗？--不，我离开那家公司已经十年了。Since从句中有延续性动词时，表示否定含义，故选D。