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
They student sat together,__happily.A sing B to sing C singi
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