But for their help, we        the program in time.
A．can not finishB．will not finish
C．had not finishD．could not have finished
D

考查虛擬語氣，but for是“要不是”，相當(dāng)于：if it had not been for their help,實(shí)際情況是他們幫忙了，他們不能及時(shí)完成計(jì)劃也是于事實(shí)不符合的。
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