In winter feeding efforts are most satisfying to people and

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/29 03:01:24

In winter feeding efforts are most satisfying to people and are of greatest benefit to birds.
and are of greatest benefit to birds 为什么要加个of
去掉of

这个是固定用法
be of +n（名词）=be+ adj（形容词）
相当于are the greastest beneficial to birds
再问：你的相当于 are the greatest beneficial 有错吧应该是 are most beneficial to birds 不过 be of + n= be+ adj 这个提醒很有用

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