Question

When one makes new friends, don’t forget ______ old ones.

A．to come up with	B．losing sight of
C．to keep track of	D．keeping in touch with

Answer 1

C

come up with意思是提出、 想出 lose sight of 看不见 keep track of 保持联系 keep in touch with保持联系。有了新朋友，别忘了老朋友。故选C。