问题:
Every year, more than 70,000,000 sharks ______ for their fins (鱼翅).
[ ]
A. were killed
B. have killed
C. are killed
D. will kill
Every year, more than 70,000,000 sharks ______ for their fins (鱼翅).
B. have killed
C. are killed
D. will kill
[ ]
A. were killed B. have killed
C. are killed
D. will kill
参考答案: