Mary should be allowed to volunteer to work at the newspaper office once a week.
如果强调施动者就加否则可以不加
they should allow Mary to volunteer to work at the newspaper office once a week.(改为被动语态)
they should allow Mary to volunteer to work at the newspaper office once a week.(改为被动语态)
不需要by them 吗？
不需要by them 吗？
英语人气：580 ℃时间：2019-08-26 08:00:08
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