A：____did the caption of the guards go up the stairs?B:Three at a_英语解答

A：____did the caption of the guards go up the stairs?B:Three at a time.
A.How many B.How for C.How soon D.How long

人气：127 ℃　时间：2020-01-30 02:24:24

解答

A为什么？因为答句中回答的是数量，保安队长上多少级台阶？一次上三级