- Why do you look so worried?
- My MacBook Pro broke down and my paper______unfinished since.

A．was leftB．has left
C．leftD．has been left

D

解析試題分析：考查時態(tài)。since后省略了“it broke down”，since+含有一般過去時的句子，與現(xiàn)在完成時連用；排除A、C；my paper和leave是動賓關(guān)系，用被動語態(tài)，故選D。
考點：考查時態(tài)

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