You can hardly imagine the once clear ca
题型:选择题
问题:
You can hardly imagine the once clear canal _____ so seriously polluted that no fish can live in it. [ ]
A. have become
B. having become
C. to have become
D. to become
You can hardly imagine the once clear canal _____ so seriously polluted that no fish can live in it. [ ]
A. have become
B. having become
C. to have become
D. to become