【题目】The barber suggested the hair style ______ be required for the celebration.
A.be referred toB.referred toC.referring toD.referred as
在线课程【答案】B
【解析】
考查非谓语动词。句意：理发师建议提到的发型是庆祝活动所必需的。refer to提到；涉及，作定语修饰the hair style，与逻辑主语 the hair style是动宾关系，所以用过去分词，表被动，选项B切题，故选B。