Sheep ____ (keep) by farmers for ____ (produce) wool and mutton.

问题描述:

Sheep ____ (keep) by farmers for ____ (produce) wool and mutton.

Sheep【are kept 】 by farmers for【producing】wool and mutton.

are kept ,producing
注:SHEEP 是复数,被动语态
FOR 后的动词要用ING形式