Listen! Mary           in the next room.
#39219
A
sings
B
is singing
C
sang
D
sing
推荐题目
Ten years ago _______ only one building in our school. And in 10 years, _______ five buildings in our school.
#41816
A
there will be; there are
B
there was; there are
C
there was; there will be
D
there will be; there was
—Where have you _______ these days? —I have_______ to Hong Kong with my friends.
#37439
A
been; gone
B
been; been
C
gone; been
D
gone; gone
I    take care of my little sister at home today. 
#40554
A
will can
B
have
C
had
D
have to.