It's polite to ________ the door before
题型:选择题
问题:
It's polite to ________ the door before you go into the room. [ ]
A. shout at
B. knock on
C. look at
D. listen to
It's polite to ________ the door before you go into the room. [ ]
A. shout at
B. knock on
C. look at
D. listen to