—I didn't go to see the doctor yesterday.
　　  —But you________.  
A．ought B．ought to C．oughted to D．ought to have
D
從對(duì)話(huà)中可以看得出來(lái),雙方談?wù)摰脑?huà)題是過(guò)去的事,故應(yīng)用ought to have +過(guò)去分詞,省略時(shí),則須在to之前加上have。錯(cuò)選B者主要是沒(méi)注意到句中的yesterday,是表過(guò)去,而非現(xiàn)在。
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