sheep feeding on this kind of grass grow faster than ones on common grass.为什么用feeding而不用fed?

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sheep feeding on this kind of grass grow faster than ones on common grass.
为什么用feeding而不用fed?

如果要用fed...就变成了sheep are fed on this.
be fed on以什么为食

这题你没打选项,但我做过 A sheep (feed)on this kind of special grass usually grow much faster than(one)on ordinary. One指同类异物.如题