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—Why do you look so worried?  

—Fred left the company half an hour ago. His work _______ unfinished since.

A. left                          B. was left            C. has left                     D. has been left

—Why do you look so worried?

—Fred left the company half an hour ago. His work _______ unfinished since.

A．left   B．was left    C．has left     D．has been left