Keep busy句型.和 keep busy （do）their work.填设么
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Keepbusy句型.和keepbusy（do）theirwork.填设么Keepbusy句型.和keepbusy（do）theirwork.填设么Keepbusy句型.和keepbusy（do）th
Keep busy句型.和 keep busy （do）their work.填设么
Keep busy句型.和 keep busy （do）their work.填设么
Keep busy句型.和 keep busy （do）their work.填设么
doing
我们学过be busy doing sth忙于做某事的意思,在这里keep相当于be动词了