We are at the library . Please ___ quiet .
#59475
A
do
B
be
C
can
D
are
推荐题目
______ your hand over your mouth when you cough. 
#66193
A
Put
B
Putting
C
To put
D
To be putting
______ left when you get to the end of the street. 
#66195
A
Keep
B
Keeping
C
To keep
D
Kept