But for her help，we       the task in time．
A．will not finishB．had not finished
C．can not finish D．could not have finished
D
考查虛擬語(yǔ)氣。句意：要不是她的幫助，我們不可能及時(shí)完成這項(xiàng)任務(wù)�！癱ouldn’t+have+done”表示對(duì)過(guò)去事情的假設(shè)，意思是本來(lái)不能夠做某事而做了。故選D。
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