问题
选择题
- Why do you look so worried?
- My MacBook Pro broke down and my paper______unfinished since.
A．was left
B．has left
C．left
D．has been left
答案
答案：D
题目分析：考查时态。since后省略了“it broke down”，since+含有一般过去时的句子，与现在完成时连用；排除A、C；my paper和leave是动宾关系，用被动语态，故选D。