That piece of music sounds quite familiar. Who _____ the piano upstairs?
#102640
A
as played
B
played
C
plays
D
is playing
推荐题目
The committee __ over the problem among themselves for two hours. 
#100019
A
has argued
B
has been arguing
C
have argued
D
have been arguing
The little boy is dirty from head to foot because he______in the mud all morning.
#104172
A
has played  
B
is playing
C
has been playing
D
was playing
— You look tired.— Yes. I ___ non-stop until 8 o’clock this morning.
#102703
A
had worked
B
work
C
have worked
D
was working