—I didn't go to see the doctor yesterday.
　　  —But you________.  
A．ought B．ought to C．oughted to D．ought to have
D
從對話中可以看得出來,雙方談?wù)摰脑掝}是過去的事,故應用ought to have +過去分詞,省略時,則須在to之前加上have。錯選B者主要是沒注意到句中的yesterday,是表過去,而非現(xiàn)在。
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