问题描述：
请教大神们一道SAT语法题!
Researchers are experimenting with various techniques for preventing the accumulation in water of high levels of nitrogen,which can kill plants and animals.
which修饰的是什么,以及怎么在其他题目中判断which修饰的是什么,THX!
Researchers are experimenting with various techniques for preventing the accumulation in water of high levels of nitrogen,which can kill plants and animals.
which修饰的是什么,以及怎么在其他题目中判断which修饰的是什么,THX!
问题解答：
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