---Listen! Who ______ in the next room? ---I think Sam is.
#41778
A
sing
B
sings
C
singing
D
is singing
推荐题目
They ____________ her to the party,so she was very happy.
#37699
A
invite
B
invited
C
will invite
D
are inviting
Tony is very nice. He is the most enjoyable person I        .
#36545
A
meet ever
B
have ever met
C
had ever met
D
met