Thesecretaryworkedlateintothenight,______alongspeechforthepresident.
A.to prepareB.preparingC.preparedD.was preparing在线课程B
解析:
现在分词作状语时,其逻辑主语必须和主句的主语保持一致,也就是说主句的主语是现在分词动作的执行者。现在分词作状语也可表示时间、原因、伴随情况、结果等。故选B。若句中逗号改为句号时,可选A作目的状语。
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