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—Why do you look so worried?  
—Fred left the company half an hour ago. His work _______ unfinished since.
A．leftB．was left C．has leftD．has been left
D
考查時(shí)態(tài)和語態(tài)。因句中有since所以要用完成時(shí)，又因空前主語是事情，所以要用被動(dòng)。
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