Agriculture officials this week said strict control pressures are in place,________ to preventthe red fire ants spreading across the country.Aintended Bintending Cto be intended Dhaving intended 选什么?为什么?

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Agriculture officials this week said strict control pressures are in place,________ to preventthe red fire ants spreading across the country.Aintended Bintending Cto be intended Dhaving intended 选什么?为什么?

Agriculture officials this week said strict control pressures are in place,________ to preventthe red fire ants spreading across the country.Aintended Bintending Cto be intended Dhaving intended 选什么?为什么?
Agriculture officials this week said strict control pressures are in place,________ to prevent
the red fire ants spreading across the country.Aintended Bintending Cto be intended Dhaving intended 选什么?为什么?

Agriculture officials this week said strict control pressures are in place,________ to preventthe red fire ants spreading across the country.Aintended Bintending Cto be intended Dhaving intended 选什么?为什么?
B、intending 原因如下
主句为一般现在式,【A】【C】均为过去式不能用,D的现在时正确,可以其已经完成的状态不对,一边在提要求一边又早已经完成了要求,会让人笑话,故这三个选项都不妥.
最后的【B】是现在时态,与原句的不定式配合说明工作的具体内容——预防,完全符合要求.