◎ 题干
When one makes new friends, don't forget _____ old ones.
[     ]
A. to put up with
B. losing sight of
C. to keep track of
D. keeping in touch with
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“When one makes new friends, don't forget_____ old ones. [ ]A. to put up with B. losing sight of C. to keep track of D. keeping in touch with …”主要考查了你对  【动词短语】【不定式】  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。