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
人气：133 ℃ 时间：2020-04-12 22:10:50
解答
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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