During the part of the meeting they mainly discussed the solution to the problem.A. lates

问题补充：

During the part of the meeting, they mainly discussed the solution to the problem.

A. latest

B. late

C. later

D. latter

答案：

A. latest

B. late

C. later

(答案→)D. latter

解析：词义辨析。Latest最新的；late晚的，迟的；later后来的，较晚的；latter后一半的。接近终了的；句意：在会议的后一部分，他们主要讨论了对这个问题的解决方法。根据句意说明D正确。