There is a bird        in the sky.
#50711
A
fly
B
flying
C
flies
D
to fly
推荐题目
You’ve spent too much time _________football.
#50831
A
play
B
playing
C
played
D
to play
Class is over. Let’s stop______ a rest.
#48819
A
having
B
to have
C
had
D
have