问题
选择题
The school rules state thatno child shall be allowed out of the school during the day,
_____accompanied by an adult. [ ]
A. once
B.when
C.if
D.unless
答案
答案：D
搜题请搜索小程序“爱下问搜题”
The school rules state thatno child shall be allowed out of the school during the day,
_____accompanied by an adult. [ ]
A. once
B.when
C.if
D.unless
答案：D