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问一个英语问题Hehasjustboughttwelvepigeons.Whendidhe_them?Aboughtbbuyscbuydbuying请问选什么,那如果单独一句是whendidhe_thosepigeons?那选什么?为什么?

题目详情
问一个英语问题
He has just bought twelve pigeons.When did he _them?A bought b buys c buy d buying 请问选什么,那如果单独一句是when did he _those pigeons?那选什么?为什么?
▼优质解答
答案和解析
C 助动词DID 后的动词要用原形,
如果单独一句是when did he _those pigeons?也是用原形