Jack offered us a big meal when he was leaving the office but our work we refused it.A.

问题补充：

Jack offered us a big meal when he was leaving the office, but our work , we refused it.

A. not finished

B. had not been finished

C. not having finished

D. wasn’t finished

答案：

(答案→)A. not finished

B. had not been finished

C. not having finished

D. wasn’t finished

解析：考查独立主格结构。our work not being 叫做 独立主格结构，这里做状语，表示原因，相当于 because our work was not finishedA, C 用的是主动式，显然不对。B 似乎对，但是两个并列句中间不能这么用逗号隔开。如果在we 前面加一个so就对了。故选A。