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with后面加过去分词
the relation development mainly focus on the economic sector,with the mainland Taiwai's largest trading partner.
为什么不能填been表示已经成为最大的贸易伙伴
人气:110 ℃ 时间:2020-06-17 12:56:55
解答
being
这里是主动意味,即“ the mainland 【is】 Taiwai's largest trading partner.
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