The two presidents agree with each other on the whole, but much remains at the following meeting.
A. discussing
B. discussed
C. to discuss
D. to be discussed
网友回答
A. discussing
B. discussed
C. to discuss
(答案→)D. to be discussed
解析：此题考查非谓语动词的用法。remain为系动词，相当于be动词，该句主语much和discuss 之间存在被动关系，且从后面的at the following meeting 知道该动作是将要发生的，故选D，而不选B。