— Why do you look so worried?
—My puter broke down and my essay unfinished since.
A. had left
B. has been left
C. has left
D. was left
网友回答
A. had left
B. has been left
C. has left
D. was left
解析：考查时态和语态。本题的关键在于找出句子的时间状语since该词通常现在完成时连用，根据句意说明本句使用被动语态的形式。句意：—为什么你看上去如此的担忧？—我的电脑坏了。从那以后我的论文就一直被留在没有完成。故B正确。