题目内容
—Why do you look so worried?
—My computer broke down and my essay ______ unfinished since.
—My computer broke down and my essay ______ unfinished since.
| A.had left | B.has left | C.was left | D.has been left |
D
考查时态。Since是现在完成时的标志,essay与leave之间是被动关系。
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