_______ such heavy pollution already, it may now be too late to clean up the river. 
#98615
A
Having suffered
B
Suffering
C
To suffer
D
Suffered
推荐题目
She couldn’t decide which restaurant _______. 
#98798
A
to have lunch
B
to eat
C
to eat at
D
eating at
They told me that the museum was well worth        .
#95292
A
visiting
B
being visited
C
to visit
D
to be visited