Sally used to walk her dog before breakfast,but now she () it after supper.A.is walking B.walks C.has walked D.walk
问题描述：
Sally used to walk her dog before breakfast,but now she () it after supper.
A.is walking B.walks C.has walked D.walk
答
A.is walking B
答
B
表现在的行为习惯， 与 used to ”过去常常“ 对应。
答
此题考查时态的判断与确定,根据语境可知是过去和现在的对比
used to do 表过去常常做某事,过去的习惯,暗示现在不那么做了.
now 表现在的习惯,用一般现在时态
答案：B 正体现为一般现在时态!