I heard him______ outside.
#50192
A
sang
B
to sing
C
singing
D
sings
推荐题目
I think you have to stop _______. It’s bad for your health.
#49229
A
smoke
B
smoked
C
smoking
D
to smoke
Thanks for ___________ my daughter to your birthday party .
#50997
A
asking  
B
asks    
C
ask
D
to ask
There are some boys ________ in the river.
#51303
A
swimming
B
to swim
C
are swimming
D
is swimming