◎ 题干
The old couple walked rather slowly, and could be seen, from time to time, to stop and rest, ________ out to sea.
A.to be staringB.stared
C.having staredD.staring
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“ The old couple walked rather slowly, and could be seen, from time to time, to stop and rest, ________ out to sea.A.to be staringB.staredC.having staredD.starin…”主要考查了你对  【现在分词的被动式】【现在分词】【不定式的被动式】【过去分词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。