Listen! Someone _____ songs.
#41840
A
are singing
B
singing
C
sing
D
is singing
推荐题目
When you are planting trees, the trees ________ straight in the hole.
#36844
A
must put
B
must be put
C
are putting
D
is put
Mr. Smith ____ the village since last year.
#42203
A
left
B
has left
C
has been away from
D
was away from
—Why didn’t you go to the movie yesterday? —Because I_________it before. 
#42506
A
had watched
B
have seen
C
have watched
D
had seen