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When one makes new friends, don’t forget ______ old ones.
A．to come up withB．losing sight of
C．to keep track ofD．keeping in touch with
C
come up with意思是提出、 想出 lose sight of 看不見 keep track of 保持聯(lián)系 keep in touch with保持聯(lián)系。有了新朋友，別忘了老朋友。故選C。
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