The workers busily when the boss came to look for something she in the office.A. had wor

问题补充：

The workers busily when the boss came to look for something she in the office.

A. had worked; had left

B. were working; had left

C. working; had left

D. had worked; left

答案：

A. had worked; had left

(答案→)B. were working; had left

C. working; had left

D. had worked; left

解析：从句when the boss… 给出了内容是句子的重心, 主句用了过去进行时交代背景,因为从句和内容重要,这里的when译成 “”这时”.