17. They can't be working now. It's time they the office.A. have leftB. would leaveC. cou

问题补充：

17. They can be working now. Its time they the office.

A. have left

B. would leave

C. could leave

D. left

答案：

A. have left

B. would leave

C. could leave

(答案→)D. left

解析：可联系答.案.网客服索取。