Question

Walter offered us a lift when he was leaving the office, but our work ________, we refused the offer．

1. A.
   not finishing
2. B.
   had not been finished
3. C.
   not having finished
4. D.
   not finished

Answer 1

D
解析：
考查非谓语动词中独立主格结构的用法。根据句子的意思，Walter下班后主动提出让我们搭车，但是我们因为尚未完成工作，拒绝了他的好意。our work与finish是被动关系，所以排除A和C两项，连词but连接的句子是we refused the offer，因此使用非谓语形式作状语，故排除B项。