单选题 You ______ her at the beginning, but now it is too late.
A. ought to refuse B. have ought to refuse
C. ought to have refused D. ought have refused

【正确答案】 C

【答案解析】本题考查的是ought to表示虚拟语气的用法。ought to have done…意思是：“本应该……(实际上却没有这样做)”。本句的意思是：“你本应该一开始就拒绝她的，现在已经太晚了。”