11．-I went to the Australia Embassy yesterday to apply for a visa．
--Oh，you _____ that because you can apply on line．（　　）
A．don't need to doB．mustn't do
C．can't have doneD．needn't have done

分析 -昨天我去澳大利亞大使館申請(qǐng)簽證了．
-哦，你本來不必如此的，因?yàn)榫W(wǎng)上也可以辦的．

解答 答案：D．
根據(jù)題干中的時(shí)間狀語yesterday可知辦簽證這事發(fā)生在過去，再由結(jié)構(gòu)"情態(tài)動(dòng)詞+have done"表"對(duì)過去情況的推測(cè)"，結(jié)合這兩者可排除選項(xiàng)A和B．C選項(xiàng)can't have done表"過去肯定沒有做某事"在此意為"昨天肯定沒有去申請(qǐng)簽證"，前后文自相矛盾，故也排除．D選項(xiàng)needn't have done表"本沒有必要做某事卻做了"．根據(jù)because從句可知，網(wǎng)上可以辦理簽證，所以"你昨天本來沒有必要去大使館辦理的"，與上文相互照應(yīng)，語意吻合，符合邏輯．故選D．

點(diǎn)評(píng) 情態(tài)動(dòng)詞與過去完成式連用，表"對(duì)過去情況的推測(cè)"，其結(jié)構(gòu)為"情態(tài)動(dòng)詞+have done"．如：can't have done表"過去肯定沒有做某事"；could have done表"本來能做成的卻沒有做成"；must have done"過去肯定做了某事"；should/ought to have done表"本該做某事卻沒有做"；shouldn't/oughtn't to have done表"本不該做某事卻做了"；needn't have done表"本沒有必要做卻做了"

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