______ at the door before entering please. 
#66016
A
Knocked
B
Knock
C
Knocking
D
To knock
推荐题目
___ put the soup left ___ the fridge.
#66308
A
Do… into
B
Don't …in
C
Not…into
D
Don’t you..in
— What should I do with this passage?—_____ the main idea of each paragraph.
#66294
A
Finding out
B
Found out
C
Find out
D
To find out