There ______ be a lot of manatees, but n
问题:
There ______ be a lot of manatees, but now they ______ endangered animals.[ ]
A. used to, become
B. would, become
C. used to, have become
D. would, have become
There ______ be a lot of manatees, but now they ______ endangered animals.[ ]
A. used to, become
B. would, become
C. used to, have become
D. would, have become