句子主干 - 柯帕斯英语网

The bear would do better in its nature habitat and the agency would step in if its condition deteriorated.

主干是什么？

是the bear would do better and the agency would step in.

问in 是否该去掉。

本句为and连接的并列句。step in为短语动词，意为：介入。in为副词，不可省略。

曹荣禄 -

擅长：动词用法,句法问题 | 采纳率 82% | 回答于 1秒前

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