_____ at the door before you come into the room.
#94211
A
Hit
B
Knock
C
Touch
D
Strike
推荐题目
Is there a shop around _____ we can buy some toilet articles?
#95148
A
that  
B
which
C
where 
D
what
Peter’s jacket looked just the same as Jack’s, but it cost ___________his. 
#92647
A
as much twice as
B
twice much as
C
twice as much as
D
as twice much as
It is required that in no case ________ our password.
#93878
A
we should forget
B
should we forget
C
shall we forget
D
we shall forget