问题
选择题
______I used to go mountain—climbing every summer .
A．at a time
B．at one time
C．At times
D．At the same time
答案
答案：B
at a time 一次；at one time 曾经
搜题请搜索小程序“爱下问搜题”
______I used to go mountain—climbing every summer .
A．at a time
B．at one time
C．At times
D．At the same time
答案：B
at a time 一次；at one time 曾经