In order to solve the problem as soon as possible, they had a discussion.
A. face-to-face
B. face to face
C. faces-to-faces
D. faces to faces
网友回答
(答案→)A. face-to-face
B. face to face
C. faces-to-faces
D. faces to faces
解析：考查固定短语。face to face相当于副词，修饰动词；face-to-face相当于形容词修饰名词，故答案为A。