—Must we keep the window _______ all the time? —No, you don’t have to. 
#54465
A
opening
B
opened
C
to open
D
Open
推荐题目
You should ________ our computer teacher ________ help.
#61456
A
ask, for
B
want, for
C
tell , about
D
let, to
— Did Jerry______any magic tricks yesterday?—No, but he______  a song.
#58351
A
performed; sang
B
performed; sing
C
perform; sang
D
perform; sing