问题
选择题
—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
答案
答案：D
考查时态和语态。因句中有since所以要用完成时，又因空前主语是事情，所以要用被动。
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