问题补充：
They always communicated with each other on the Internet, but they never met him .
A. back to back
B. heart to heart
C. face to face
D. side to side
答案：
A. back to back
B. heart to heart
(答案→)C. face to face
D. side to side
解析：短语辨析。back to back背靠背，连续； heart to heart率直的，诚实的； face to face 面对面的，对立的 ；side to side 边对边。句意：他们总是在互联网上相互沟通，但是他们从来没有面对面见过。故选C。
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