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?

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

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