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Whether working alone or in a group,students share ideas and discussions on the subject being(未完
studied(这里为什么是用being studied而不是studied)
人气:350 ℃ 时间:2019-11-04 13:58:52
解答
这里的being studied的being强调的是正在被研究学习的科目.如果无being就不是正在的意思.being done是现在时的被动语态
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