Theambulancewasjustarriving,foraworker,who

问题详情：

 The ambulance was just arriving, for a worker, who ______ the window on the second floor, fell off the window.    

    A. had been repairing               B. was repairing

    C. has been repairing                     D. would be repairing

【回答】

A

知识点：过去完成时及其被动式

题型：选择题