题目内容

-- Why do you look so worried ?
-- My MacBook Pro broke down and my paper _____ unfinished ever since.
A．leftB．was leftC．has been leftD．has left
C

试题分析：考查时态：句意：--你为什么看起来这么担心？-- 我的MacBook Pro坏了，我的论文自从那时还留在那里没有完成。从ever since可知是现在完成时，从paper和leave的关系，可知是被动。选C。
点评：时态题的考查关键是抓住句子的上下文含义和句中的时间状语。要根据时间状语来选择合适的时态，在平时的学习中要注意积累有关时态的用法和各种时态的特殊之处。如since， so far等经常与现在完成时连用。
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