He was heard________ three songs in the next room.
#93484
A
sing
B
to sing
C
singing
D
sung
推荐题目
The path______the park is lined with many trees.
#97097
A
leading to
B
led to
C
was leading to
D
which leading to
He did nothing but ________walk in the street. 
#95370
A
taking    
B
take    
C
to take    
D
took