All of them felt it necessary that they the meeting
A. attend
B. would have attended
C. attended
D. were to attend
网友回答
(答案→)A. attend
B. would have attended
C. attended
D. were to attend
解析：句意：他们都觉得他们有必要参加会议。feel it+形容词+that…it是形式宾语，that引导的是真正的宾语从句，it is necessary that 主语+should do这里应该是虚拟语气，should可以省略。故选A。