A. has been married B. has married

C. should be married D. would marry

【答案】C

【解析】考查虚拟语气。句意：真的很奇怪这个女孩这么早结婚。在“It is+形容词+that...”句型中，that从句要用虚拟语气，其谓语动词形式为“should+动词原形”，should可以省略。故选C。