For many years we have been keeping in by sending each other e-mails or phone calls.A. co

问题补充：

For many years we have been keeping in by sending each other e-mails or phone calls.

A. connection

B. contrast

C. relation

D. touch

答案：

A. connection

B. contrast

C. relation

(答案→)D. touch

解析：本题的含义为数年来我们通过发电子邮件或打电话保持着联系，keep in touch with表示保持联系的含义，故本题选D。