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13．---How dangerous it was!
---Yes，but for the passer-by's quick action，the girl _____．（　�。�
A．had been drownedB．might be drowned
C．would have been drownedD．must have been drowned

分析 -好險啊！-嗯，要不是路人反應快，這這小女孩就溺水了．

解答 答案：C 句意表達的是相反假設，要用虛擬；對過去的虛擬，要用情態(tài)動詞加完成時態(tài)；must have done表示對過去的推測，不符合句意．故選C．

點評 虛擬語氣是表示與事實相反的假設，構成方式有：對現在或將來，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，要牢記構成方式．

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