一句英语选择题 (课后P51)?

Who ________ it? Grandfather did.
A. buy B.was bought C.bought D.did buy
为什么这句话选C.bought? 这面这句话grandfather did 说全了怎么说。谢谢。

did 是过去式。所以答案是过去式
A.现在式不符合
B.be+PP 是被动式 不符合意思
C. buy的过去式 符合 did 时态
D. did buy 是 do 是加强语气 I do love you. 但用在疑问句不合适。
grandfather did 说全 grandfather bought it.追问

为什么 grandfather bought it.可以说成
grandfather did.

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