But for their help，we         the program in time.
A．can not finishB．will not finish
C．had not finishedD．could not have finished
D
本題考察虛擬語(yǔ)氣.But for起到了對(duì)過(guò)去虛擬的條件句作用,后面自然要選would/could/might/should+have done結(jié)構(gòu)了.
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