单选题In order to solve th

问题补充：

单选题Inordertosolvetheproblemassoonaspossible,theyhada__________discussion.A.face-to-faceB.face to faceC.faces-to-facesD.faces to faces

答案：

A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