—Do you hear the noise outside?—Yes. There must be some kids __________ outside.
#51016
A
have fun
B
has fun
C
to have fun
D
having fun
推荐题目
I want ___ a policeman because it is an exciting ____.
#51250
A
to be , job
B
doing , work
C
to do , job
D
be , work
They were made _______ the whole night. 
#50613
A
working
B
work
C
to work
D
worked
He spends as much time as he can _______ English.
#50544
A
reading
B
to read
C
read
D
will read