问题描述：
这个句子里现在分词spraying to...是句子中的什么成分
the situation took an alarming turn with the outbreak of four more new pests,necessitating pesticide spraying to such a extent that 50% of the fanancial outlay on cotton production was accounted for by pesticides.
the situation took an alarming turn with the outbreak of four more new pests,necessitating pesticide spraying to such a extent that 50% of the fanancial outlay on cotton production was accounted for by pesticides.
问题解答：
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