Hawks serve an important purpose in the scheme of nature ______ on destructive r

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问题 Hawks serve an important purpose in the scheme of nature ______ on destructive rodents, such as mice and rats.

选项 A、by preying
B、in order that preying
C、that they prey
D、than to prey

答案 A

解析此句中by与分词搭配做方式状语

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Hawksserveanimportantpurposeintheschemeofnature______ondestructiver