3．But for their help，we ____ the program in time．（　�。�
A．can not finishB．will not finish
C．had not finishedD．could not have finished

分析 要不是他們幫忙，我們不可能及時完成這項計劃．

解答 答案：D 題干表達與事實相反的假設(shè)，要用虛擬；對過去的虛擬，主句要用情態(tài)動詞加完成時態(tài)來構(gòu)成；句中but for相當于條件句if they hadn't helped us．故選D．

點評 虛擬語氣是表示與事實相反的假設(shè)，構(gòu)成方式有：對現(xiàn)在或?qū)�，條件句中用一般過去時態(tài)，主語用情態(tài)動詞加動詞原形；對過去，條件句中用過去完成時態(tài)，主語用情態(tài)動詞加完成時態(tài)．學習時，要牢記構(gòu)成方式．

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