问题补充:
environmental damage is done, it takes many years for the ecosystem to recover.
A. Even if
B. If only
C. While
D. Once
答案:
A. Even if
B. If only
C. While
(答案→)D. Once
解析:
时间:2021-01-15 21:45:49
environmental damage is done, it takes many years for the ecosystem to recover.
A. Even if
B. If only
C. While
D. Once
A. Even if
B. If only
C. While
(答案→)D. Once
解析: