问题
选择题
The boys _______themselves last night, did they?
A enjoyed B didn’t enjoy C haven’t enjoyed D have enjoyed
答案
答案：B
反意疑问句中问句部分的动词与陈述部分的动词在语气上成相反的对应关系，即：肯定+否定？ 否定+肯定？从下文did they?可知上文应是否定形式,过去时态,助动词为did,所以选B.