— Why do you look so worried?
—My computer broke down and my essay ______ unfinished since.
A．had leftB．has been left
C．has leftD．was left
B

試題分析：考查時(shí)態(tài)和語態(tài)。本題的關(guān)鍵在于找出句子的時(shí)間狀語since該詞通�，F(xiàn)在完成時(shí)連用，根據(jù)句意說明本句使用被動(dòng)語態(tài)的形式。句意：—為什么你看上去如此的擔(dān)憂？—我的電腦壞了。從那以后我的論文就一直被留在沒有完成。故B正確。
點(diǎn)評(píng)：本題的關(guān)鍵在于找出時(shí)間狀語since自從，該詞通�，F(xiàn)在完成時(shí)連用。同時(shí)還可以改為ever since等。
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