英语语法：—Why do you look worried?

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英语语法：—Why do you look 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
选哪个,为什么?

D.has been left
这是现在完成时的被动语态
unfinished是过去分词作主补也就是原来的宾补
主动语态是 leave sth done句型
本句写成主动语态是 Fred has left his work unfinished since
注意本题的关键是副词since ,该词作副词用时只能与完成时连用.
所以本题不选 B
再问：如果本题无sice 是否可以选B？
再答：可以但最好写成并列句。也就是一句话。—Fred left the company half an hour ago，and his work was left unfinished 。

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