Listen! Mary           in the next room.
#39219
A
sings
B
is singing
C
sang
D
sing
推荐题目
The mobile phone has influenced people’s life a lot since it      .
#39054
A
invents
B
invented
C
is invented
D
was invented
—Why is the classroom so dirty?—Sorry,sir. It       yesterday, We forgot to do it.
#39874
A
doesn’t clean
B
didn’t clean
C
isn’t cleaned
D
wasn’t cleaned
What       the women     under the tree ?
#41969
A
is,doing
B
does,do
C
are,doing
D
are,do