I hear the birds _______.
#51349
A
sing
B
to sing
C
sings
D
singing
推荐题目
He is afraid of ________ English in public.
#49891
A
speak
B
speaking
C
spoken
D
speaks
You must stop _______. My father is sleeping. 
#48869
A
talk
B
talking
C
to talk
D
talks
I saw him ______ the game on the computer yesterday evening.
#49945
A
played
B
playing
C
play
D
to play