单选题
Meanwhile, I always
kept in touch with
my former professor at college.
A、
kept in contact with
B、
kept pace with
C、
had an idea of
D、
exchanged letters with
【正确答案】
A
【答案解析】
keep in contact with保持联系；keep pace with与……保持联系；have an idea of有……想法；exchange letters with与……互通信函。因为keep in touch with意为“保持接触/联系”，故选A项。
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