◎ 题干
____ the days he had spent with his American friends, he couldn’t help_____.
A.Keeping up; smileB.Staying up; smiling
C.Looking back on; smilingD.Looking at; to smile
◎ 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 days he had spent with his American friends, he couldn’t help_____.A.Keeping up; smileB.Staying up; smilingC.Looking back on; smilingD.Looking at;…”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。