They student sat together,__happily.A sing B to sing C singing D and singing

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Theystudentsattogether,__happily.AsingBtosingCsingingDandsingingTheystudentsattogether,__happily.Asi

They student sat together,__happily.A sing B to sing C singing D and singing
They student sat together,__happily.A sing B to sing C singing D and singing

They student sat together,__happily.A sing B to sing C singing D and singing
选 C
因为前一句是过去时,如果是并列句的话,后面的动词也应使用过去时,根据给的答案看,无过去时选项,因此排除A 和 D,to sing是表示目的,singing是表示伴随的动作,从句意分析,该句后一部分是表示伴随的状态,故选C

选d

选择C singing happily作伴随状况状语
不能选择D是因为and是用来连接并列成分的，本句中前后两部分明显不是并列关系。

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