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
考查虛擬語氣。根據(jù)But for their help要不是他們的幫助；可知這是一個與過去事實相反的含蓄的虛擬語氣句，后面主句應(yīng)該使用情態(tài)動詞+have done;句意：要不是他們的幫助，我們不能夠及時完成這項計劃。
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