—Are you still working in that pany, Mary?
—No, it is ten months I worked there.
A. after
B. that
C. before
D. since
网友回答
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。