—Why do you look so worried? 
—My computer broke down and my essay ______ unfinished since.
A．had leftB．has leftC．was leftD．has been left
D
考查時(shí)態(tài)。Since是現(xiàn)在完成時(shí)的標(biāo)志，essay與leave之間是被動(dòng)關(guān)系。
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