问题
选择题
______ met, it won’t be easily forgotten.
A．If you
B．when it
C．once
D．Once you were
答案
答案：C
once引导的条件状语从句，省略了it is。
搜题请搜索小程序“爱下问搜题”
______ met, it won’t be easily forgotten.
A．If you
B．when it
C．once
D．Once you were
答案：C
once引导的条件状语从句，省略了it is。