12．If it           for his invitation the other day，I should not be here now．（　�。�
A．had not beenB．should not be
C．were not to beD．should not have been

分析 如果前些日子沒有同意他的邀請，現(xiàn)在我就不會在這里了．

解答 答案：A
根據(jù)句意可知，該句是錯綜時間虛擬條件句．主句"I should not be here now．"表達(dá)的是與現(xiàn)在事實相反的情況；意為：現(xiàn)在我就不會在這里了；而根據(jù)if從句中表示過去的時間狀語"the other day前些日子"可知，此處表達(dá)的應(yīng)該是與過去事實相反的情況，所以要使用過去完成時；故選A

點評 本題考查的是錯綜時間虛擬條件句．做此類題時，首先需要熟練掌握錯綜時間虛擬條件句的定義及用法：通常條件從句與主句所指的時間不一致，所以它們所使用的時態(tài)各不相同；如本題從句指與過去事實相反的情況，需要用過去完成時；而主句指的是與現(xiàn)在事實相反的情況，因此使用了would+動詞原形的形式；有時還應(yīng)根據(jù)具體的語境情況對時態(tài)作相應(yīng)的調(diào)整．

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