问题
选择题
It is not polite to enter others' rooms _______ knocking on the door. [ ]
A. by
B. with
C. without
答案
答案：C
搜题请搜索小程序“爱下问搜题”
It is not polite to enter others' rooms _______ knocking on the door. [ ]
A. by
B. with
C. without
答案：C