"The door is open.Could you have forgotten to lock the door?" "Yes,I_"A could B could have C might have not D can not have为什么选B?求详解

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"Thedoorisopen.Couldyouhaveforgottentolockthedoor?""Yes,I_"AcouldBcouldhaveCmighthavenotDcannothave为

"The door is open.Could you have forgotten to lock the door?" "Yes,I_"A could B could have C might have not D can not have为什么选B?求详解
"The door is open.Could you have forgotten to lock the door?" "Yes,I_"
A could B could have C might have not D can not have
为什么选B?求详解

"The door is open.Could you have forgotten to lock the door?" "Yes,I_"A could B could have C might have not D can not have为什么选B?求详解
回答语完整的是:Yes ,I could have forgotten to lock the door.因为这句子里的谓语有两个助动词could have ,所以不能省略成Yes ,i could.这样会产生歧义,因为这样可以理解这句是I could forget to lock the door,与原句不符.
所以这种有两个助动词的谓语的省略应该省略到第二个助动词.
C和D两个答案与前一句不搭配,不一致.

yes I could have forgotten to lock the door
的简落回答
带着have 强调过去完成这一时态