题目内容
---The numbers of some kinds of sharks _____ really quickly in the last 20 to 30 years
---Yes, the government should develop laws to stop the sale of shark fins.
A. fell B. fall
C. have fallen D. are falling
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题目内容
---The numbers of some kinds of sharks _____ really quickly in the last 20 to 30 years
---Yes, the government should develop laws to stop the sale of shark fins.
A. fell B. fall
C. have fallen D. are falling